Merge "Remove legacy subscription code" into udc-dev am: 1b4966a032 am: 2812ba27bb

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

Change-Id: I1e8e17d548131660e07a925aa30af089798ea26a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>