Prevent non-admin users from deleting system apps. am: 6c870e15 am:...

Prevent non-admin users from deleting system apps. am: 6c870e15 am: 15ab50ec am: d719add2 am: a6038bd5 am: 9c4a46ca

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



Change-Id: I3eba76e5313d759bf813461cdd53ddf1f58d7629
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>