Start/stop foreground service delegate for musicfx app. am: 05536405bf

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2787259

Change-Id: I3b4095eb20a94798267dcbf8db2fc92f3d1132f8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>