Filter spam notifications

Change-Id: Ibf2377cd7491c7e0e9e9c9657e9e65eef1876ee3

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java

Change-Id: I2db96a66b20fa8602c2a1391edde8e3240c7c634
Merge "Filter spam notifications" into pac-4.4