Merge pi-dr1-dev to aosp-master

Change-Id: I8739f24b4a87116aa291fe06cc24ebd28135ad0e
tree: 027f1322a61ef15c2877a39dabf9fbf0a5681791
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk