Prevent non-admin users from deleting system apps. am: 6c870e1579 am: 15ab50ec29 am: d719add201 am: a6038bd5cc am: 9c4a46cae8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17408864

Change-Id: I3eba76e5313d759bf813461cdd53ddf1f58d7629
Signed-off-by: Automerger Merge Worker <[email protected]>