Framework: Less Notification Sounds (1/2)

Ported 'Bluewall Firewall' from AOKP

mutes notification sounds for an application for <X> seconds after playing

Patchset 2: rebase

Change-Id: I6da924ad1e4cf2facea82224e914e3a6a31610de

Conflicts:
	services/java/com/android/server/NotificationManagerService.java