blk-integrity: convert to struct device_attribute

An upcoming patch will register the integrity attributes directly with
the struct device kobject.
For this the attributes have to be implemented in terms of
struct device_attribute.

Signed-off-by: Thomas Weißschuh <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]>
Link: https://lore.kernel.org/r/20230309-kobj_release-gendisk_integrity-v3-2-ceccb4493c46@weissschuh.net
Signed-off-by: Jens Axboe <[email protected]>

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