rhine: Enable deep buffer output as primary

 * Since we're not offloading audio during AV playback, it's
   better to use DEEP_BUFFER as the primary output and only
   select the FAST output when the flag is set. This saves
   power during video playback.

Change-Id: I0a16822a07c0f3eea1456c7c74bbc23a2e68f033
rhine: Enable new mixer and add properties for compress offload

Change-Id: I83c6dbb5ff7e3bc6fd165b643df086038673514d