Merge "Do not register event until entering the state" into udc-dev am: 69f0e4c2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/21617344



Change-Id: I320c2d2698a3199abb5206a7d23c4e7a982a46a9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>