arcnet: com20020-pci: constify attribute_group structures.

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

File size before:
   text	   data	    bss	    dec	    hex	filename
   3409	    948	     28	   4385	   1121	drivers/net/arcnet/com20020-pci.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
   3473	    884	     28	   4385	   1121	drivers/net/arcnet/com20020-pci.o
Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/arcnet/com20020-pci.c

@@ -109,7 +109,7 @@ static struct attribute *com20020_state_attrs[] = {
 	NULL,
 };
 
-static struct attribute_group com20020_state_group = {
+static const struct attribute_group com20020_state_group = {
 	.name = NULL,
 	.attrs = com20020_state_attrs,
 };