scsi: qla2xxx: Correction and improvement to fwdt processing

This patch cleans up and fixes firmware dump template processing. These
changes are added to support newer features for ISP27XX/ISP28XX.

Signed-off-by: Joe Carnuccio <joe.carnuccio@cavium.com>
Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>