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

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

Change-Id: I90677b25fa84a3f15884bb9ff78655cb5add06c4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>