of: eliminate of_device->node and dev_archdata->{of,prom}_node

This patch eliminates the node pointer from struct of_device and the
of_node (or prom_node) pointer from struct dev_archdata since the node
pointer is now part of struct device proper when CONFIG_OF is set, and
all users of the old pointer locations have already been converted over
to use device->of_node.

Also remove dev_archdata_{get,set}_node() as it is no longer used by
anything.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/of/of_mdio.c

@@ -79,7 +79,6 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 		/* Associate the OF node with the device structure so it
 		 * can be looked up later */
 		of_node_get(child);
-		dev_archdata_set_node(&phy->dev.archdata, child);
 		phy->dev.of_node = child;
 
 		/* All data is now stored in the phy struct; register it */