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

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

Change-Id: I502afd2fc2c4459bbcb62c1ad76a04a1b41dc461
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>