Fix security vulnerability when register phone accounts. am: ce3216cbde am: 39be728302

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/20055816

Change-Id: I4c2bbc7656e2a27be32caf7cefbc77a70b0fc302
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>