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

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



Change-Id: I9b9874f0ffa87fca85c28a94da31e7d8d3d2ae95
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>