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: Ia123b158d6a73a458fddb0b7d8266082e6d88c39
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>