Merge "Call streaming implementation cleanups." into udc-dev am: c7cae571 am: 7039ff8a

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



Change-Id: Ibd4d8ef3d3db4350c7a98ae89b020d588592163e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>