Lockscreen Notifications: fix show/hide of show all button

& fix endless SystemUI FC when SystemUI is killed

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

Change-Id: I9a2caea4feeeb9e1608a086e06694fc334ec93a4
Lockscreen Notifications: Custom background color [1/2]

Change-Id: I26868f78bc57390df7ea7e7a600081852d8b5d6f