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sound: Implement AFMT_FLOAT support

Even though the OSS manual [1] advises against using AFMT_FLOAT, there
are applications that expect the sound driver to support it, and might
not work properly without it.

This patch adds AFMT_F32_LE|BE (as well as AFMT_FLOAT for OSS
compatibility) in sys/soundcard.h and implements AFMT_F32_LE|BE <->
AFMT_S32_LE|BE conversion functions. As a result, applications can
write/read floats to/from sound(4), but internally, because sound(4)
works with integers, we convert floating point samples to integer ones,
before doing any processing.

The reason for encoding/decoding IEEE754s manually, instead of using
fpu_kern(9), is that fpu_kern(9) is not supported by all architectures,
and also introduces significant overhead.

The IEEE754 encoding/decoding implementation has been written by Ariff
Abdullah [2].

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sound: Update COPYRIGHT notices

Only to files I've currently made significant contributions to.

Sponsored by:   The FreeBSD Foundation
MFC after:      1 week

(cherry picked from commit c824383b269d8abe175ea4751194660716d5600e)

sound: Turn clamp macros into a function

This makes some subsequent feeder refactors easier to implement.

Sponsored by:   The FreeBSD Foundation
MFC after:      1 week
Differential Revision:  https://reviews.freebsd.org/D48421

(cherry picked from commit 4918fc2e238b581aaf1f63e20003d5fa957f0b09)

sound: Refactor the format conversion framework

Merge the PCM_READ|WRITE_* macros defined in pcm/pcm.h, as well as the
intpcm_read|write_* macros defined in pcm/feeder_format.c, into six
inline functions: pcm_sample_read|write[_norm|calc](). The absence of
macro magic makes the code significantly easier to read, use and modify.

Since these functions take the input/output format as a parameter, get
rid of the read() and write() function pointers defined in struct
feed_format_info, as well as the feeder_format_read|write_op()
functions, and use the new read/write functions directly.

Sponsored by:   The FreeBSD Fondation
MFC after:      1 week
Reviewed by:    markj
Differential Revision:  https://reviews.freebsd.org/D47932

(cherry picked from commit 433e270f341cf660b2fe125c2e0f733073829188)

sound: Update COPYRIGHT notices

Only to files I've currently made significant contributions to.

Sponsored by:   The FreeBSD Foundation
MFC after:      1 week

sound: Turn clamp macros into a function

This makes some subsequent feeder refactors easier to implement.

Sponsored by:   The FreeBSD Foundation
MFC after:      1 week
Differential Revision:  https://reviews.freebsd.org/D48421

sound: Refactor the format conversion framework

Merge the PCM_READ|WRITE_* macros defined in pcm/pcm.h, as well as the
intpcm_read|write_* macros defined in pcm/feeder_format.c, into six
inline functions: pcm_sample_read|write[_norm|calc](). The absence of
macro magic makes the code significantly easier to read, use and modify.

Since these functions take the input/output format as a parameter, get
rid of the read() and write() function pointers defined in struct
feed_format_info, as well as the feeder_format_read|write_op()
functions, and use the new read/write functions directly.

Sponsored by:   The FreeBSD Fondation
MFC after:      1 week
Reviewed by:    markj
Differential Revision:  https://reviews.freebsd.org/D47932

sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Similar commit in current:
(cherry picked from commit 95ee2897e98f)

sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with:         pfg
MFC After:              3 days
Sponsored by:           Netflix

(cherry picked from commit 4d846d260e2b9a3d4d0a701462568268cbfe7a5b)

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with:         pfg
MFC After:              3 days
Sponsored by:           Netflix

Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from:     pfg

sys/dev: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

IFC @r269962

Submitted by:   Anish Gupta (akgupt3 at gmail.com)

Merge head from 7/28

Sync to HEAD at r269943.

Remove ia64.

This includes:
o   All directories named *ia64*
o   All files named *ia64*
o   All ia64-specific code guarded by __ia64__
o   All ia64-specific makefile logic
o   Mention of ia64 in comments and documentation

This excludes:
o   Everything under contrib/
o   Everything under crypto/
o   sys/xen/interface
o   sys/sys/elf_common.h

Discussed at: BSDcan

Copy releng/8.3 to release/8.3.0 as part of the 8.3-RELEASE build process.

Approved by:    re (implicit)

This commit was manufactured to restore the state of the 8.3-RELEASE image.

Copy releng/8.2 to release/8.2.0 for 8.2-RELEASE.

Approved by:    re (implicit)

This commit was manufactured to restore the state of the 8.2-RELEASE image.

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Copy releng/8.1 to release/8.1.0 for 8.1-RELEASE.

Approved by:    re (implicit)

This commit was manufactured to restore the state of the 8.1-RELEASE image.

Create release/8.0.0 for the 8.0-RELEASE.

Approved by:    re (implicit)

This commit was manufactured to restore the state of the 8.0-RELEASE image.

Merge from head

- Merge from HEAD

Sound Mega-commit. Expect further cleanup until code freeze.

For a slightly thorough explaination, please refer to
        [1] http://people.freebsd.org/~ariff/SOUND_4.TXT.html .

Summary of changes includes:

1 Volume Per-Channel (vpc).  Provides private / standalone volume control
  unique per-stream pcm channel without touching master volume / pcm.
  Applications can directly use SNDCTL_DSP_[GET|SET][PLAY|REC]VOL, or for
  backwards compatibility, SOUND_MIXER_PCM through the opened dsp device
  instead of /dev/mixer.  Special "bypass" mode is enabled through
  /dev/mixer which will automatically detect if the adjustment is made
  through /dev/mixer and forward its request to this private volume
  controller.  Changes to this volume object will not interfere with
  other channels.

  Requirements:
    - SNDCTL_DSP_[GET|SET][PLAY|REC]_VOL are newer ioctls (OSSv4) which

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