NextBSD/src 9810356sys/dev/sound/usb uaudio.c

Add support for adjusting the hardware buffering delay for USB audio.

Requested by:   Goran Mekic <meka at tilda.center>
MFC after:      1 week
DeltaFile
+30-5sys/dev/sound/usb/uaudio.c
+30-51 files

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