Ariff Abdullah ee8e8d867e Add support for (latest) VIA VT8251 (rev. 0x07) audio controller.
A slight difference of this chip from its previous siblings is that
it need a gentle "wake up" on every (full) DMA buffer completion to
avoid stalled interrupt handler.

Thanks to George Hartzell for permission on doing remote debugging.

Prime MFC candidate for 6.1-RELEASE. Please reply to this commit if
there are any objections  (so I won't bug re@),  since the  changes
are too small and only specific to VT8251.

PR:		i386/95949
Tested by:	[1] George Hartzel
          	myself (remotely)
MFC after:	3 days

[1] http://lists.freebsd.org/pipermail/freebsd-multimedia/2006-April/004003.html
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