VoipCallMonitor updates; stopFGS when notifs are removed am: 1feb0f280c am: 79e5238418

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

Change-Id: I16361a9632491b940047ce186a6595bb341f465c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>