Cleanup flag for notification sound Uri permission check

 Needed for the security bulletin.

Flag: EXEMPT security fix

Test: atest PreferencesHelperTest
Test: atest NotificationManagerServiceTest
Bug: 337775777
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:a6e1ff31bb807aa7aa0d4251f779429441b55ea3)
Merged-In: If206fb7cfc832f66f0e677c687537062ad0d7043
Change-Id: If206fb7cfc832f66f0e677c687537062ad0d7043
4 files changed