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 am: 3b791c6a

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



Change-Id: I508d2b56917c720675f23a7c57a9f781029805f4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>