Merge "Call streaming implementation cleanups." into udc-dev am: c7cae571 am: bb3e15bc

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



Change-Id: I80fa3e1cd2ec3724babd9fe9683b5843c4ffe5ff
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>