Merge "Call streaming implementation cleanups." into udc-dev am: c7cae57131 am: 7039ff8acd

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

Change-Id: I493cfcd9299a05dcec4a38cfbe1a7101fb108b1d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>