Settings: move keyguard wallpaper to system (2/2)

Change-Id: Id3bb66aa78c2e3dbd1170e74e33fcd160e5a70bb
Signed-off-by: Roman Birg <roman@cyngn.com>

Conflicts:
	res/xml/theme_settings.xml
	src/com/android/settings/cyanogenmod/LockscreenInterface.java
Add wallpaper pickers to seperate package [2/2]

Change-Id: I233b90aa52b5a8c408fa3adfe3bdad07330cc2ad