Merge "Explicitly set apex updatable to false." am: 78beda626e am: caf71a4c9a am: 1aa98c77ba

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telephony/+/1589974

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7d3ce88a215619ede849467dc39f9440ce94a166