sd: only call disk_clear_zoned when needed

disk_clear_zoned only needs to be called when a device reported zone
managed mode first and we clear it.  Add a check so that disk_clear_zoned
isn't called on devices that were never zoned.

This avoids a fairly expensive queue freezing when revalidating
conventional devices.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Damien Le Moal <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

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