Merge "Notify source transport for upcoming handover" into tm-qpr-dev am: 5fb50336

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/19224118



Change-Id: I1091d1bb8b487b487c968c86e77a673fcba215d2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>