audio: add support for extended audio features

- Add extended enums for audio stream, audio
  source, audio format, audio channel, audio
  device, and audio flag.
- Update audio API's to support extended features.
- Add new API's for compress offload playback,
  capture, and VOIP features.

Change-Id: I8dfd64ac39ee392993e2b977907cd8280952460f
Conflicts:
include/system/audio.h
Conflicts:
include/system/audio.h