MFC (revision 1.54):
MFC (revision 1.54):

Limit total playback channels to just 1, for ALi M5451.
The reliability of it's multi DAC / playback channels is
not that good. Enabling vchans make the bug more visible
since playback allocation will look for possible free
hardware channels first (i.e: the next DAC, the very first
has been consumed by vchan mixer) which in this case has
been proven faulty.

Reported / Tested by:   Sascha Klauder

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