Merge cherrypicks of [6974857, 6974139, 6974140] into pi-qpr3-b-release

Change-Id: I9d71e351408142aa5e1ebcf25f2256924a23c452
tree: 751e81525d4e79a4d27767ddea212dc0f3944cd2
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk