scsi: bfa: Declare 'bfad_im_vport_attrs' static

Fix the following kernel-doc warning:

'bfad_im_vport_attrs' is only used in one source file. Hence declare this
array static.

Link: https://lore.kernel.org/r/20211129194609.3466071-7-bvanassche@acm.org
Fixes: e73af234 ("scsi: bfa: Switch to attribute groups")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/bfa/bfad_attr.c

@@ -981,7 +981,7 @@ const struct attribute_group *bfad_im_host_groups[] = {
 	NULL
 };
 
-struct attribute *bfad_im_vport_attrs[] = {
+static struct attribute *bfad_im_vport_attrs[] = {
 	&dev_attr_serial_number.attr,
 	&dev_attr_model.attr,
 	&dev_attr_model_description.attr,