VoipCallMonitor updates; stopFGS when notifs are removed am: 1feb0f280c am: 9331e6ad76

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/23619482

Change-Id: If3ed82a70c53b716a478f6bd18f2235e4a5f7600
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>