dm-bow: Fix 5.15 compatibility issue

dm-bow: Fix 5.15 compatibility issue

https://patchwork.kernel.org/project/linux-block/patch/20210804094147.459763-8-hch@lst.de/

delays registering the gendisk, so move creating our sysfs nodes until
resume.

Orignal-Author: Paul Lawrence <paullawrence@google.com>
Origin: https://android.googlesource.com/kernel/common/+/88e27b17aab604fb2d486e538b2ef55cd967a430%5E%21/#F0
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: Ib328a4b1f989cdd7359c186668417f85d633b29a
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>