Update audio config

Change-Id: I7b5858db0a410053d9fba88a54608c99ed31cb58
overlay: enable config_auto_provision_enable for msim

Change-Id: Idbe78d190a1e3f4b68cfbf9f9a59191c73429c5d
proprietary-files: Use stock audio.primary for now

Change-Id: I8b4c661392da27c1be99352991c9635ebdd7b508
overlay: Enable config_dontPreferApn true

This fixes the issue with prepaid ATT sims not falling over to
correct apn.

Change-Id: I761f8ae0197b9cf64c8166ea520aeaa401525125
Use stock mixer_paths.xml with stock audio.primary

Change-Id: Ia7ca8538408399a9bdb8f60a931a088daef624d9