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: 6c3ef665

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



Change-Id: I137f450e5282d3f7051cd67b15bec65e0828ab0b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>