Settings: Enable Lockscreen orientation (2/2)

patchset 2
- remove old static vars

Conflicts:
	res/values/strings.xml
	res/xml/lockscreen_interface_settings.xml
	src/com/android/settings/slim/LockscreenInterface.java

Change-Id: I0b9c6b8b5066ac0452ae585a83a5206c0da40994