Merge "block call forwarding MMI codes from apps" into udc-dev am: 9393d8c4 am: 3171e5f5

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/22792583



Change-Id: I15a5756ccbac8dff60b60ad0c5a932ce56b161ab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>