ARM: dts: imx6: add mxs phy controller id

We need to use controller id to access different register regions
for mxs phy.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
index e78497e..8948016 100644
--- a/arch/arm/boot/dts/imx6qdl.dtsi
+++ b/arch/arm/boot/dts/imx6qdl.dtsi
@@ -35,6 +35,8 @@
 		spi1 = &ecspi2;
 		spi2 = &ecspi3;
 		spi3 = &ecspi4;
+		usbphy0 = &usbphy1;
+		usbphy1 = &usbphy2;
 	};
 
 	intc: interrupt-controller@00a01000 {