scsi: ibmvfc: ibmvscsi: ibmvscsi_tgt: constify vio_device_id

vio_device_id are not supposed to change at runtime. All functions
working with vio_device_id provided by <asm/vio.h> work with const
vio_device_id. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ibmvscsi/ibmvfc.c

@@ -4925,7 +4925,7 @@ static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
 	return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
 }
 
-static struct vio_device_id ibmvfc_device_table[] = {
+static const struct vio_device_id ibmvfc_device_table[] = {
 	{"fcp", "IBM,vfc-client"},
 	{ "", "" }
 };

drivers/scsi/ibmvscsi/ibmvscsi.c

@@ -2330,7 +2330,7 @@ static int ibmvscsi_resume(struct device *dev)
  * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we 
  * support.
  */
-static struct vio_device_id ibmvscsi_device_table[] = {
+static const struct vio_device_id ibmvscsi_device_table[] = {
 	{"vscsi", "IBM,v-scsi"},
 	{ "", "" }
 };

drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c

@@ -4086,7 +4086,7 @@ static struct class ibmvscsis_class = {
 	.dev_groups	= ibmvscsis_dev_groups,
 };
 
-static struct vio_device_id ibmvscsis_device_table[] = {
+static const struct vio_device_id ibmvscsis_device_table[] = {
 	{ "v-scsi-host", "IBM,v-scsi-host" },
 	{ "", "" }
 };