Merge "Remove legacy subscription code" into udc-dev am: 1c414978 am: 758d684f

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



Change-Id: I355cfd340a56db4cb7efb1c301f25fc8e5df4b2c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>