Revert "Fix ZRAM dependencies"

This reverts commit 6ca51af0cf1afdc7f7e8096cfe98a0769f2316b6.
Revert "Add back zram and zcache"

This reverts commit 550e7fac4663266d562fa3dbb3a9ea50d6fd7afb.

Conflicts:
	drivers/staging/Kconfig
	drivers/staging/Makefile