Merge "[Safety Labels] Enable safety label change notifications flag by...

Merge "[Safety Labels] Enable safety label change notifications flag by default in PackageManager code" into udc-dev am: c1e42bd0 am: 05e23992

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22748343



Change-Id: Ie0c5cf168335daf53122204ac21a2e8777dcafeb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>