Merge "Adds system settings related to flash notifications in settings...

Merge "Adds system settings related to flash notifications in settings provider" into udc-dev am: 2c86b407

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21517335



Change-Id: I47de3e060836379a45c40e3028383e9c8a0906bd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>