scsi: cxlflash: Update sysfs helper routines to pass config structure

scsi: cxlflash: Update sysfs helper routines to pass config structure

BugLink: http://bugs.launchpad.net/bugs/1702521
As staging for future function, pass the config pointer instead of the AFU
pointer for port-related sysfs helper routines.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 3b225cd32a05b627a6ca366f364a824beaabecc5)
Signed-off-by: Victor Aoqui <victora@linux.vnet.ibm.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>