Merge "CallAudioRouteController: fix possible  null pointer dereference in onAvailableRoutesChanged()" into main am: ca434bbcc5

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telecomm/+/3274171

Change-Id: I7cf54ea52d7c8cbce0398bcec04053aee63acbce
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>