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

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



Change-Id: I083b24ca1854956016d0962803c5135a8746750f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>