dm: exynos: dts: Use GPIO bank phandles for GPIOs

U-Boot now supports using GPIOs using bank phandles instead of global
numbers. Update the exynos device tree files to use this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/arch/arm/dts/exynos5250-smdk5250.dts b/arch/arm/dts/exynos5250-smdk5250.dts
index 8850409..9273562 100644
--- a/arch/arm/dts/exynos5250-smdk5250.dts
+++ b/arch/arm/dts/exynos5250-smdk5250.dts
@@ -146,6 +146,6 @@
 	};
 
 	ehci@12110000 {
-		samsung,vbus-gpio = <&gpio 0x316 0>; /* X26 */
+		samsung,vbus-gpio = <&gpx2 6 GPIO_ACTIVE_HIGH>;
 	};
 };