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: I847ef254c9e8f2a9d8ea8644f04e8b9a795f2e29
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>