of: Convert to using %pOF instead of full_name

Now that we have a custom printf format specifier, convert users of
full_name to use %pOF instead. This is preparation to remove storing
of the full path string for each node.

Signed-off-by: Rob Herring <robh@kernel.org>
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index e0dbd6e..754b9d6 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -166,8 +166,8 @@
 
 	if (of_match_node(whitelist_phys, child)) {
 		pr_warn(FW_WARN
-			"%s: Whitelisted compatible string. Please remove\n",
-			child->full_name);
+			"%pOF: Whitelisted compatible string. Please remove\n",
+			child);
 		return true;
 	}