sparc: Annotate of_device_id arrays with const or __initdata.

As suggested by Stephen Rothwell.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/niu.c b/drivers/net/niu.c
index e4765b7..016d9e0 100644
--- a/drivers/net/niu.c
+++ b/drivers/net/niu.c
@@ -9074,7 +9074,7 @@
 	return 0;
 }
 
-static struct of_device_id niu_match[] = {
+static const struct of_device_id niu_match[] = {
 	{
 		.name = "network",
 		.compatible = "SUNW,niusl",