scsi: ncr53c8xx: Remove unused code

Link: https://lore.kernel.org/r/20210820095405.12801-4-hare@suse.de


Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>