Merge "[pm] forbid deletion of protected packages" into tm-dev am: 12e837e3...

Merge "[pm] forbid deletion of protected packages" into tm-dev am: 12e837e3 am: afb5d201 am: 689f4b13

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19929347



Change-Id: I923ad3bba8c7cb73df8e00080426529ba33a28df
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>