LN: bring inline with AOSPAL implementation

Change-Id: I1a8746fae482ab2ce6d1120564f48f3b31179e68

Conflicts:
	packages/Keyguard/res/layout-land/keyguard_host_view.xml
	packages/Keyguard/res/layout-port/keyguard_host_view.xml
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java
	packages/Keyguard/src/com/android/keyguard/NotificationHostView.java
	packages/Keyguard/src/com/android/keyguard/NotificationViewManager.java