Future Domain 16xx ISA SCSI support card support.

Tested on IBM 92F0330 card (18C50 chip) with v1.00 BIOS.
Signed-off-by: Ondrej Zary <linux@zary.sk>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>