of: Remove struct device_node.type pointer

Now that all users of device_node.type pointer have been removed in
favor of accessor functions, we can remove it.

Cc: Frank Rowand <frowand.list@gmail.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

include/linux/of.h

@@ -50,7 +50,6 @@ struct of_irq_controller;
 
 struct device_node {
 	const char *name;
-	const char *type;
 	phandle phandle;
 	const char *full_name;
 	struct fwnode_handle fwnode;