Revert "fix zram_for_android compiling"

This reverts commit e39a8d758ec2a043d634ce8be32a72f0423c7ca9.
Revert "zram: last time"

This reverts commit e81b8299e2188ce8911ad3d7549ef06de24019fd.
Revert "zram: forgot to fix the name of zram_num_devices in zram_drv.h"

This reverts commit ec9247df1b252140a643cdf316a6772840b4ea5d.
Revert "zram_sysfs: num_devices was renamed to zram_num_devices"

This reverts commit c607fd0857fc738836c94faad9a07997bab2687d.
Revert "Add ZRAM_FOR_ANDROID, with all of the bits"

This reverts commit 962a4373cbdf443e1c444eba27106fc008e8e8f1.