MusicFx: add a KeepAliveService to allow client app to bind

So MusicFx activity can be same ProcessState as client APP

Bug: 293204643
Bug: 265114634
Test: MusicFx BindService can be bind with the test app correctly
Test: dumpsys activity
Change-Id: Id751854861d10d5aa31dbb4ae471e403398b0e4e
Merged-In: Id751854861d10d5aa31dbb4ae471e403398b0e4e
2 files changed
tree: 05f4c053e04fdd9ec53e9d6b93fa2f49ed0d11d4
  1. res/
  2. src/
  3. Android.bp
  4. AndroidManifest.xml
  5. OWNERS