Add UID permission check to update_engine am: 596969b84d am: 4465217f5a am: 0aaa4e44d9 am: 1b5207f446

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2774952

Change-Id: Ieb6bc495d08d3501405b13170b2dc026fed04c54
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>