Fix headphone/speaker automute for [1] Acer Aspire 5050 and [2] MSI MS-1034 laptops.
Fix headphone/speaker automute for [1] Acer Aspire 5050 and [2] MSI MS-1034
laptops.

Tested by:	[1] Lion G. <liontanker@hotmail.com>
          	[2] Pietro Cerutti <pietro.cerutti@gmail.com>

Specialized mixer initialization for STAC9221, much like STAC9220.

Tested by:	Devon H. O'Dell

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