sparc64: Apply const or __initdata to vio_device_id[]

This mirrors the of_device_id[] changes done in
fd098316ef533e8441576f020ead4beab93154ce ("sparc: Annotate
of_device_id arrays with const or __initdata.")

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/sunvnet.c b/drivers/net/sunvnet.c
index 6415ce1..a720065 100644
--- a/drivers/net/sunvnet.c
+++ b/drivers/net/sunvnet.c
@@ -1,6 +1,6 @@
 /* sunvnet.c: Sun LDOM Virtual Network Driver.
  *
- * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
+ * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
  */
 
 #include <linux/module.h>
@@ -1260,7 +1260,7 @@
 	return 0;
 }
 
-static struct vio_device_id vnet_port_match[] = {
+static const struct vio_device_id vnet_port_match[] = {
 	{
 		.type = "vnet-port",
 	},