updated zram, zcache and zsmalloc from my smdk4412 source

Conflicts:
	drivers/staging/zcache/Kconfig
	drivers/staging/zcache/Makefile
	drivers/staging/zcache/zcache-main.c
	drivers/staging/zram/Kconfig
	drivers/staging/zram/xvmalloc.c
	drivers/staging/zram/zram_drv.c
	drivers/staging/zram/zram_drv.h
	drivers/staging/zram/zram_sysfs.c