scsi: qla1280: Fix hw revision numbering for ISP1020/1040

Fix the hardware revision numbering for Qlogic ISP1020/1040 boards.  HWMASK
suggests that the revision number only needs four bits, this is consistent
with how NetBSD does things in their ISP driver. Verified on a IPS1040B
which is seen as rev 5 not as BIT_4.

Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://lore.kernel.org/r/20241113225636.2276-1-linmag7@gmail.com


Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>