Merge "Call streaming implementation cleanups." into udc-dev am: c7cae571 am: d450ad13 am: e99d8e51

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



Change-Id: Ib707d07da53e2b087a8d907122ef8646231e4f02
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>