Adjust avatar used for call streaming notification. am: 8a0898a7b6

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/23181934

Change-Id: I724c06ac798a425f55c26f0a16bd8e904538c567
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>