Merge "[pm] forbid deletion of protected packages" into qt-dev am: b625b562

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19935572



Change-Id: Ic0c235c82f13e4e8f09b35bb9f30134cfcf8617e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>