frameworks: move keyguard wallpaper to system  (1/2)

Change-Id: I0eb1b5578b705c2ade4c0772fa86e09478b9f73e
Signed-off-by: Roman Birg <roman@cyngn.com>

Conflicts:
	core/java/android/provider/Settings.java
	core/res/res/values/cm_strings.xml
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java