mondrianwifi: Collapse primary audio outputs.

This appears to fix crackle on low-latency streams for the
hlte and fixes bug CYAN-4020 for them.

Modeled from http://review.cyanogenmod.org/62284

Change-Id: I4ad18f6a9a5e7fa6062c3bcd42d466a5c1291189
mondrianwifi: audio: Adding missing USB audio device for voip

This is untested, just noticed that I was missing this one line
of the audio_policy.xml file.

Change-Id: I0e1af59dbac1eca0bb60bc4a3dd6d96fe592619f
mondrianwifi: audio: Add USB audio playback use-cases

Kanged from hlte.

Change-Id: I156ab1abc2ab05806fe74a5fbc6540ba42670e9e
Merge remote-tracking branch 'cm/cm-11.0' into HEAD