net: ibm: ibmveth: constify dev_pm_ops structures.

dev_pm_ops are not supposed to change at runtime. All functions
working with dev_pm_ops provided by <linux/device.h> work with const
dev_pm_ops. So mark the non-const structs as const.

File size before:
   text	   data	    bss	    dec	    hex	filename
  15426	   1256	      0	  16682	   412a	drivers/net/ethernet/ibm/ibmveth.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
  15618	   1064	      0	  16682	   412a	drivers/net/ethernet/ibm/ibmveth.o
Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/ibm/ibmveth.c

@@ -1914,7 +1914,7 @@ static struct vio_device_id ibmveth_device_table[] = {
 };
 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
 
-static struct dev_pm_ops ibmveth_pm_ops = {
+static const struct dev_pm_ops ibmveth_pm_ops = {
 	.resume = ibmveth_resume
 };