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

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



Change-Id: Ia3f480c776b3038cf0acd1c37502276abd7e0efe
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>