[SCSI] qla2xxx: Collapse and simplify ISP2XXX firmware dump routines.

Add IO-base-window accessor functions.  Merge duplicate
RISC-pause and soft-reset code segments.  Drop 'eye-watering'
__iomem casting.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>