ARM: zynq: Convert to using %pOFn instead of device_node.name

In preparation to remove the node name pointer from struct device_node,
convert printf users to use the %pOFn format specifier.

Cc: Michal Simek <michal.simek@xilinx.com>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/mach-zynq/slcr.c

@@ -233,7 +233,7 @@ int __init zynq_early_slcr_init(void)
 
 	register_restart_handler(&zynq_slcr_restart_nb);
 
-	pr_info("%s mapped to %p\n", np->name, zynq_slcr_base);
+	pr_info("%pOFn mapped to %p\n", np, zynq_slcr_base);
 
 	of_node_put(np);