hal: add support to separate headset and headphones mixer backend am: 6c5e87cca3
am: 3a04c9e7a3

Change-Id: I5234bfe4b17acaf4e363a64ca5c072ea79ef9366
tree: aa3db0dfc1bf0a873c2b9491be760bed4a8b4181
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk