settings: lockscreen widgets (2/2)

see fb commit for more details

Change-Id: Ia8c365121c5f2fda92080b67717f50de25beb9bc

Conflicts:
	res/values/slim_strings.xml
	res/xml/security_settings_chooser.xml
	res/xml/security_settings_password.xml
	res/xml/security_settings_pin.xml
	src/com/android/settings/SecuritySettings.java