Merge "enforce stricter rules when registering phoneAccounts" into rvc-dev am: 06920b605c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/21120805

Change-Id: I91745e96a64006889715492770642a14ca46c8fb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>