Clear notifications for packages whose permission is revoked

Previously this was done only on the setNotificationsEnabledForPackage() codepath, called by Settings UI. This meant that notifications would remain if the permission was revoked through other means, such as via permission Backup & Restore or via `adb shell pm revoke` (and possibly others). Now we listen to AppOp mode changes (for `OP_POST_NOTIFICATION`) and react to them, for a more consistent behavior.

This CL also removes some unused or obsolete parameters from cancelAllNotificationsInt, together with the ACTION_QUERY_PACKAGE_RESTART broadcast listener.

MUST_SLEEP: To test the effects of a postDelayed() call.

Test: atest NotificationManagerService + manual
Fixes: 288651621
Change-Id: I6ec1c75f206bc3b3c4252768a433b886b3983be8