NUMA: make sure that the node device class is registered before the node driver.

This fixes an Oops on boot on NUMA systems, since the driver tries to access the 
device class when it's registered. 

drivers/base/node.c

@@ -93,7 +93,7 @@ int __init register_node(struct node *node, int num, struct node *parent)
 
 static int __init register_node_type(void)
 {
-	driver_register(&node_driver);
-	return devclass_register(&node_devclass);
+	devclass_register(&node_devclass);
+	return driver_register(&node_driver);
 }
 postcore_initcall(register_node_type);