Merge cherrypicks of [3761525, 3761526, 3762421, 3761280, 3761527, 3761325] into pi-release

Change-Id: Ie6108f194bceac73cb0aefd7d27e27104f2430c6
tree: 9618a11a9cd00f4c966c252d3815ceaec5c38c9f
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk