ARM: dts: add usb 2.0 clock references to exynos5250 device tree

This is a fixup to two device tree nodes that have already landed but
without clock nodes since the transition to common clock happened at
the same time.
Signed-off-by: NDoug Anderson <dianders@chromium.org>
Reviewed-by: NJingoo Han <jg1.han@samsung.com>
[gautam.vivek@samsung.com: tested on smdk5250]
Tested-by: NVivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5250.dtsi

@@ -471,12 +471,18 @@
 		compatible = "samsung,exynos4210-ehci";
 		reg = <0x12110000 0x100>;
 		interrupts = <0 71 0>;
+
+		clocks = <&clock 285>;
+		clock-names = "usbhost";
 	};
 
 	usb@12120000 {
 		compatible = "samsung,exynos4210-ohci";
 		reg = <0x12120000 0x100>;
 		interrupts = <0 71 0>;
+
+		clocks = <&clock 285>;
+		clock-names = "usbhost";
 	};
 
 	amba {