mips: bmips: bcm3368: include dt-bindings

Now that there are proper device tree bindings we can start using them.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/boot/dts/brcm/bcm3368.dtsi

 // SPDX-License-Identifier: GPL-2.0
+
+#include "dt-bindings/clock/bcm3368-clock.h"
+
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;