Revert "Add UKSM 0.1.2"

This reverts commit a311fea7198cca01d1b671f7cdd4dafe5d7586a8.

Conflicts:

	Documentation/vm/uksm.txt
	include/linux/sradix-tree.h
	include/linux/uksm.h
	lib/sradix-tree.c
	mm/uksm.c