Merge "Call streaming implementation cleanups." into udc-dev am: c7cae57131

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/22912703

Change-Id: I84f3a3a6f98af19269070220e78caa79bb8ea569
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>