Merge "Migrate reigster service callback backend" am: ee0e6cd701

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2424806

Change-Id: Ife2beed45ce911a9b49fe8f6fe8513391ababdd3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>