Settings: Add support for variable size pattern lockscreen (Part 2/2)

Part 1: http://review.cyanogenmod.org/#/c/28533/

Forward port of: http://review.cyanogenmod.org/#/c/20614/

Add a menu to choose the pattern unlock screen size (currently 3x3 to 6x6)
Default size is specified in the frameworks

Change-Id: I016f6cf7688121df5d681d117c35fa8ec2ade497

Conflicts:

	src/com/android/settings/ChooseLockGeneric.java
	src/com/android/settings/ChooseLockPatternTutorial.java
LockPatternSize: fix up for jb-4.3