hal: Add support to get active microphones on input stream
am: debab2be23

Change-Id: If829c713d70c0afe7f0dc98fce60620b6af13675
tree: 3f43a94594311e5a04da4dd34c83d86cf6feb186
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk