mips: bmips: bcm63268: include dt-bindings

Now that there are proper device tree bindings we can start using them.

Signed-off-by: Álvaro Fernández Rojas <[e-mail]>
Acked-by: Florian Fainelli <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

arch/mips/boot/dts/brcm/bcm63268.dtsi

···
 // SPDX-License-Identifier: GPL-2.0
+
+#include "dt-bindings/clock/bcm63268-clock.h"
+#include "dt-bindings/reset/bcm63268-reset.h"
+#include "dt-bindings/soc/bcm63268-pm.h"
+
 / {
 	#address-cells = <1>;
 	#size-cells = <1>;