hal: add support to separate headset and headphones mixer backend am: 9536e67b03
am: 42da8213e8

Change-Id: Ic16691d5d354b0f14dae31013859de34e2d8beb2
tree: e58fb9fda3216a958d93f5ec6486d4d566c1d7b6
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk