Merge changes from topic "audio stat"

* changes:
  Add startup time from idle statistics
  Track alsa buffer underruns
tree: 225a5a3f1befeb45b169d03818863649ed999fed
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk
  7. OWNERS