scsi: qla2xxx: Turn on FW option for exchange check

Tell FW to track exchange/cmd state to prevent driver from using stale
exchange or exchange that is not meant for this command.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>