ANDROID: dm-bow: Fix 5.15 compatibility issue

Patch

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.

Test: runs
Bug: 210958368
Change-Id: If671893d50434bb39ea37babb0bea05cebae6f54
Signed-off-by: Paul Lawrence <paullawrence@google.com>