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

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

Change-Id: I6c88ec8102a0eda66c28b8d59e455b823fc18844
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>