Merge "Add RootTargetPreparer for explicitly specifying the root dependency" into main am: db9c70b222

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2963543

Change-Id: I46ce0e2228e248ad6b5d83bff1afca837d9ec392
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>