Update audio config

Change-Id: I7b5858db0a410053d9fba88a54608c99ed31cb58
proprietary-files: Use stock audio.primary for now

Change-Id: I8b4c661392da27c1be99352991c9635ebdd7b508
Use stock mixer_paths.xml with stock audio.primary

Change-Id: Ia7ca8538408399a9bdb8f60a931a088daef624d9