scsi: sd_zbc: Initialize device request queue zoned data

Initialize the seq_zones_bitmap, seq_zones_wlock and nr_zones fields of
the disk request queue on disk revalidate. As the seq_zones_bitmap and
seq_zones_wlock allocations are identical, introduce the helper
sd_zbc_alloc_zone_bitmap(). Using this helper, reallocate the bitmaps
whenever the disk capacity (number of zones) changes.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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