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MFC i386 stand cleanup: r337353-r337354, r337356, r337872, r337878, r337881,
r337890-r337891, r338188

r337353:
loader: cstyle cleanup for biosdisk.c

Also switch u_int to uint32_t. Also replace "write" by "dowrite".
No functional changes intended.

r337354:
loader: 337353 did miss to rename 2 write instances

2 write instances got somehow missed.

r337356:
loader: bd_open() should cleanup from disk_open() error

Since bd_open() does early increment for reference counter and bcache
allocation, it also should undo those in case of the error.

Also remove unused variables rdev, g_err.

r337872:
libi386: remove BD_SUPPORT_FRAGS

BD_SUPPORT_FRAGS is preprocessor knob to allow partial reads in bioscd/biosdisk
level. However, we already have support for partial reads in bcache, and there
is no need to have duplication via preprocessor controls.

Note that bioscd/biosdisk interface is assumed to perform IO in 512B blocks,
so the only translation we have to do is 512 <-> native block size.

r337878:
libi386: remove bd_read() and bd_write() wrappers

Those wroappers are nice, but do not really add much value.

r337881:
libi386: use BD_RD and BR_WR constants

Use BD_RD and BD_WR instead of 0 and 1.

r337890:
libi386: small style updates in biosdisk

Use break instead of return in for loop, as done earlier. Insert and remove
some blank lines. No functional changes intended.

r337891:
libi386: bd_io_workaround() is to be called for reads only

bd_io() can perform either reads or writes, we only need bd_io_workaround()
for reads.

r338188:
loader: bios loader should allow to chain load a file

The current chain command does accept only device, allow also a file to be used,
such as /boot/pmbr or /boot/mbr (or stored third party MBR/VBR block).

Also fix file descriptor leak.

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