Attempt at updating snd_hda

[ss griffon]

I would like to attempt to fix this bug in the snd_hda driver:
http://bugs.dragonflybsd.org/issues/2090.  This is the bug where jack
detection is broken.  I've got a couple of questions that I would like
to ask:

1. Is anybody currently working on this?  I don't want to redo
something that has already been done.

2.  Does DFBSD still not support uncacheable DMA?

3.  How far out of sink is DFBSD's OSS from FreeBSD?  Has it been
updated since the fork?