Merge "Call streaming implementation cleanups." into udc-dev am: c7cae571 am: d450ad13

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



Change-Id: I388d988e54fa9cd2b45df26a2c64126648f4b2f8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>