Merge "Broadcast subId upon service initialized" into udc-dev am: 267e9454 am: 4feb30cc

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/22339247



Change-Id: I01cc33a19e9b51bb1e1ed5b74eceaaf329e137dd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>