Merge "Add RootTargetPreparer for explicitly specifying the root dependency" into main am: 40673c5711 am: 11556257e6

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2961299

Change-Id: Id3e431dc1d9ddedde4fc786cd2bba045885618ab
Signed-off-by: Automerger Merge Worker <[email protected]>