Revert "zram_drv: switch default compressor to new lz4"

This reverts commit 437b6f93fc52ada11a92f7915dce4d4749b3de03.
Revert "staging: zram: add per-cpu support to Crypto"

This reverts commit 82069f11eb0806a11f9a3c338a7ecffc3df6014c.
Revert "staging: zram: add Crypto API support"

This reverts commit c1cff48fb2a8c2b096d22a3b3e6e76782230e798.

Conflicts:
	drivers/staging/zram/zram_drv.c