scsi: aacraid: Get correct lun count

scsi: aacraid: Get correct lun count

BugLink: http://bugs.launchpad.net/bugs/1746801
The correct lun count needs to be divided by 24, missed it in the
previous patch set.

Fixes: 4b00022753550055 (scsi: aacraid: Create helper functions to get lun info)
Signed-off-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit bbd16d96d1ec531f6ad950d01b542422040033b8)
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>