Settings: Lockscreen Rotation Optional (2/2)

Much more customizable than other implementations

PS2: Allow multiple values
	(enable, disable, portrait, landscape)

PS3: Fix default summary for tablets.

Change-Id: I58d8b4c6db0f0c24787c9c21175040c33567359b

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