Merge "Remove legacy subscription code" into udc-dev am: 1c414978 am: 18daa586

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/22657349



Change-Id: I93ebf7aabf66dff569966b8bdfc0f74973959fdb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>