Revert "strage way of getting zcache to work..."

This reverts commit eef1ef6c0132b84f9f4d4007d024ca1caa217202.

Conflicts:
	drivers/staging/android/lowmemorykiller.c
	drivers/staging/zcache/Kconfig
	drivers/staging/zcache/zcache-main.c

Change-Id: Idf20cc22f741988b323e6b1bde6eabd7f3c67fd9