Merge "Revert "Prevent non-admin users from deleting system apps."" into tm-dev am: c10451f7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19336831



Change-Id: I3e8ca204897199c6cfd5b1ea132b55e1fc20a7de
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>