Merge changes from topic "cf_stream_opus" into cuttlefish-testing

* changes:
  Receive opus and play using SDL2
  Stream opus instead of raw pcm16
tree: a6caa74b1e8951bd479b55057a9344ee44ca90a1
  1. common/
  2. guest/
  3. host/
  4. tests/
  5. tools/
  6. Android.bp
  7. Android.mk
  8. OWNERS