of: make __of_attach_node() static

__of_attach_node() is not used outside of drivers/of/dynamic.c.  Make
it static and remove it from drivers/of/of_private.h.
Signed-off-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Rob Herring <robh@kernel.org>

drivers/of/dynamic.c

@@ -216,7 +216,7 @@ int of_property_notify(int action, struct device_node *np,
 	return of_reconfig_notify(action, &pr);
 }
 
-void __of_attach_node(struct device_node *np)
+static void __of_attach_node(struct device_node *np)
 {
 	const __be32 *phandle;
 	int sz;

drivers/of/of_private.h

@@ -90,7 +90,6 @@ extern int __of_update_property(struct device_node *np,
 extern void __of_update_property_sysfs(struct device_node *np,
 		struct property *newprop, struct property *oldprop);
 
-extern void __of_attach_node(struct device_node *np);
 extern int __of_attach_node_sysfs(struct device_node *np);
 extern void __of_detach_node(struct device_node *np);
 extern void __of_detach_node_sysfs(struct device_node *np);