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>
diff --git a/arch/powerpc/kernel/of_device.c b/arch/powerpc/kernel/of_device.c
index 285c849..20b3474 100644
--- a/arch/powerpc/kernel/of_device.c
+++ b/arch/powerpc/kernel/of_device.c
@@ -69,12 +69,10 @@
 	if (!dev)
 		return NULL;
 
-	dev->node = of_node_get(np);
+	dev->dev.of_node = of_node_get(np);
 	dev->dev.dma_mask = &dev->dma_mask;
 	dev->dev.parent = parent;
 	dev->dev.release = of_release_dev;
-	dev->dev.archdata.of_node = np;
-	dev->dev.of_node = np;
 
 	if (bus_id)
 		dev_set_name(&dev->dev, "%s", bus_id);