Merge "Hold the reference of TelephonyCallback" into tm-dev am: 76de9f1e am: 6078a922 am: 0cb4e452

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17946240



Change-Id: I552c7362982d0215ee6a6939b00bc2655bbe69a4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>