[SCSI] qla2xxx: Process marker IOCB request on request queue 0.

When multiple request queues are created process the marker IOCB request
on request queue 0.

Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>