Notificaitons: fix show/hide of show all button

& fix endless SystemUI FC when SystemUI is Killed

Change-Id: I1bcb11ea09979bfe2c72beb260e8e78124c4c86d
Signed-off-by: hany <hany.alsamman@gmail.com>

Conflicts:

	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java

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