Merge changes from topic "audio-hal-vsid" into pi-dev

* changes:
  audio-hal: Use call state to ensure voice call start
  Revert "audio-hal: Update voice 'in_call' flag"
tree: 2d6a3bcc8d0a284380c00cbfa624be803fae39f8
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk