MFC r230181, r230312, r230326, r230331, r230451, r230465, r230488,

MFC r230181, r230312, r230326, r230331, r230451, r230465, r230488,
r230507, r230511, r230513, r230532, r230537, r230551, r230554, r230571,
r230574, r230585, r230641, r230768, r230807, r231024:
Sync snd_hda(4) driver with HEAD.

This includes major code refactoring, HDMI support, new volume control,
automatic recording source selection, runtime reconfigureation, support
for more then 4 PCM devices on controller, multichannel recording,
additional playback/record streams, higher bandwidths support, more
informative device names and many other things.

Sponsored by:	iXsystems, Inc.

git-svn-id: svn://svn.freebsd.org/base/stable/8@236753 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f