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: I9d3a461e88f22720844c4ea6523f1218ab407c47
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>