audio: compress offload enhancements

1) Parse and set encoder metadata (delay, padding)
2) Call compress_next_track to allow partial drain
3) Do not flush output on returning succesfully from partial drain

Change-Id: I0fa1a2c968a5590dff9b6c58bd52bb111dcf3e9b
Bug: 8174410
2 files changed
tree: f6bd04605751a0f7c95f3155b015cffff66b5c45
  1. hal/
  2. legacy/
  3. voice_processing/
  4. Android.mk