Merge "hal: add sidetone support for USB" into oc-dr1-dev
am: 3a2808261f

Change-Id: I137f39de09a49b6d49e1077a7ab31c721d197b2e
tree: fee204bbfae92ccd71f2b9e8ff7f6d8da956bbd9
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk