blk-integrity: register sysfs attributes on struct device

blk-integrity: register sysfs attributes on struct device

Upstream commit ff53cd52d9bdbf4074d2bbe9b591729997780bd3.

The "integrity" kobject only acted as a holder for static sysfs entries.
It also was embedded into struct gendisk without managing it, violating
assumptions of the driver core.

Instead register the sysfs entries directly onto the struct device.

Also drop the now unused member integrity_kobj from struct gendisk.

Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20230309-kobj_release-gendisk_integrity-v3-3-ceccb4493c46@weissschuh.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>
[cascardo: conflict because of constification of integrity_ktype]
[cascardo: struct gendisk is defined at include/linux/genhd.h]
[cascardo: there is no blk_trace_attr_group]
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@igalia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>