Revert "services: don't clear wallpaper when SystemUI"

This reverts commit 99b549a534f49f88fa5bacdbbfd551fb9acabb37.
frameworks/base: remove some duplicate ringtones/notification sounds

PS2: Start mk file cleanup
PS3: Remove empty mk files
PS4: Remove more dupes and unused audio

Change-Id: I7a091218e41b3cf7eea9738d9ea569d9cb3ee91d
Allow disabling the privacy guard notification

Change-Id: I060139f75edb63572f9c3922e56ee871e765c02a