Replace PlaybackActivityMonitor with AudioDeviceCallback am: e30838778e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/MusicFX/+/22168604

Change-Id: I450e24316f451797169e436fd40f9c6c6cc2dd2f
Signed-off-by: Automerger Merge Worker <[email protected]>
tree: 43cbe1a2cfafcb6e770c3de0d357bdb98d651ee3
  1. res/
  2. src/
  3. Android.bp
  4. AndroidManifest.xml
  5. OWNERS