Merge "Remove BackendUnifiedServiceManager::getImpl" into main am: 365596b10e am: da8d2862a0

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/3317775

Change-Id: I605396417b2c6e992367e23c9649a07b6eea18a6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>