Revert "staging: zram: Add auto loading of module if user opens /dev/zram."

This reverts commit 9f3a14a94c2aa95ce7613f1e8aeb0796904c2f28.
Revert "zram: destroy all devices on error recovery path in zram_init()"

This reverts commit c6b795f8e613c89e5a6b1a7c2ae87b1acaf697f1.