Merge "Remove legacy subscription code" into udc-dev am: 1b4966a032

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telephony/+/22657743

Change-Id: I3f94a2ebf556a05e94ad18db0f46f5a9fe15d480
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>