ARM: dts: imx6: RDU2: Add Micrel PHY interrupt

The Micrel PHY has its interrupt pin connected to a GPIO line. Wire
this up in the device tree.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Chris Healy <cphealy@gmail.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi

@@ -61,7 +61,11 @@ mdio1: mdio {
 		         &gpio6 4 GPIO_ACTIVE_HIGH>;
 
 		phy: ethernet-phy@0 {
+			pinctrl-0 = <&pinctrl_rmii_phy_irq>;
+			pinctrl-names = "default";
 			reg = <0>;
+			interrupt-parent = <&gpio3>;
+			interrupts = <30 IRQ_TYPE_LEVEL_LOW>;
 		};
 	};