Revert "mm/Kconfig: add ZSWAP writeback options"

This reverts commit 525389651e4581cd53cae4476056ce170de03511.
Revert "zswap: use LZ4 if available"

This reverts commit 0996cdc714e1451506ff66dc9d62a905c37a71d6.
Revert "Added zswap, frontswap, vnswap"

This reverts commit da831ab82b233f39afda5693c683a7e4a0c390bf.