arm: orion5x: add ehci bindings to dtsi

The orion5x SoC also includes a USB EHCI componment so lets add that
to the dtsi (disable by default incase the pins are not broken out).
Signed-off-by: NAlexander Clouter <alex@digriz.org.uk>
Signed-off-by: NJason Cooper <jason@lakedaemon.net>

arch/arm/boot/dts/orion5x.dtsi

@@ -69,6 +69,20 @@
 			status = "okay";
 		};
 
+		ehci@50000 {
+			compatible = "marvell,orion-ehci";
+			reg = <0x50000 0x1000>;
+			interrupts = <17>;
+			status = "disabled";
+		};
+
+		ehci@a0000 {
+			compatible = "marvell,orion-ehci";
+			reg = <0xa0000 0x1000>;
+			interrupts = <12>;
+			status = "disabled";
+		};
+
 		sata@80000 {
 			compatible = "marvell,orion-sata";
 			reg = <0x80000 0x5000>;