scsi: sd: sd_zbc: Use PAGE_SECTORS_SHIFT

Use PAGE_SECTORS_SHIFT instead of open-coding it.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20230613-sd_zbc-page_sectors-v1-1-363460a4413d@wdc.com


Reviewed-by: Niklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>