Revert "Staging: Migrate Zram to ZsmAlloc"

This reverts commit 8c00a06d3df2516c2ce108ad9de4d580cbb4cf75.

Conflicts:
	drivers/staging/zram/zram_sysfs.c
Revert "zram: optimize for Android use"

This reverts commit 26dafe4654de561a9c13503c7a52101309cc5088.

Conflicts:
	drivers/staging/zram/zram_sysfs.c