[PATCH staging-next] zram: remove zram_sysfs file (v2)

Move zram sysfs code to zram drv and remove zram_sysfs.c file. This gives ability to make static a number of previously exported zram functions, used from zram sysfs, e.g. internal zram zram_meta_alloc/free(). We also can drop zram_drv wrapper functions, used from zram sysfs: e.g.

[PATCH staging-next] zram: remove zram_sysfs file (v2)

Move zram sysfs code to zram drv and remove zram_sysfs.c file. This gives ability to make static a number of previously exported zram functions, used from zram sysfs, e.g. internal zram zram_meta_alloc/free(). We also can drop zram_drv wrapper functions, used from zram sysfs: e.g.