audio: derive sound device for concurrent playback usecases am: 2d809e0d10
am: 8a692c65cc

Change-Id: I038b8de8e00c71ddee1d542e895bcee7bdfd26e2
tree: 3d936ae520314999361fd50f24729c3861036a66
  1. hal/
  2. legacy/
  3. post_proc/
  4. visualizer/
  5. voice_processing/
  6. Android.mk