[1/2] Base: Option to enable Notification Light when screen is on

This makes it possible to let the Notification LED flash even when the screen is on

Change-Id: I58be9646cdc84d4765342a5ab45b4641c3d5daba
Revert "frameworks/base: Fix for the race in Wallpaperservice"

This reverts commit 5fd33b9c5670e65ee0445bf401ff7c11df9d52f7.