Settings: Security: implement a pin keypad shuffler [2/2]

Change-Id: Ifb10c6d93b2549bb1c8d8e5aedc677bd93410ec0

Thanks to ResurrectionRemix Team.

Conflicts:
	res/values/rr_arrays.xml
	res/values/rr_strings.xml
	res/xml/security_settings_pin.xml
	src/com/android/settings/SecuritySettings.java