ARM: dts: Remove unneeded GPIO include in exynos4412-odroidu3

The <dt-bindings/gpio/gpio.h> header is already included in the
exynos4412-odroid-common DTSI so there's no need to do it again
in the DTS file.
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

arch/arm/boot/dts/exynos4412-odroidu3.dts

@@ -13,7 +13,6 @@
 
 /dts-v1/;
 #include "exynos4412-odroid-common.dtsi"
-#include <dt-bindings/gpio/gpio.h>
 
 / {
 	model = "Hardkernel ODROID-U3 board based on Exynos4412";