Merge "Add RootTargetPreparer for explicitly specifying the root dependency" into main am: db9c70b222 am: f0315a82a9

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

Change-Id: Ife82097e391445d574e0750274107e595f8940bd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>