fdts: corstone700: add NXP isp1763 node to device tree

Add USB IP node as the MPS3 board has the NXP isp1763 host controller.

Change-Id: I47c57e4c8345d244c46895b52fcaecc1c6f1b504
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: lakshmi Kailasanathan <lakshmi.Kailasanathan@arm.com>

fdts/corstone700_fpga.dts

@@ -20,6 +20,13 @@
 		reg-io-width = <2>;
 		smsc,irq-push-pull;
 	};
+
+	usb: usb@4020000 {
+		compatible = "nxp,usb-isp1763";
+		reg = <0x40200000 0x100000>;
+		interrupt-parent = <&gic>;
+		interrupts = <GIC_SPI 114 IRQ_TYPE_LEVEL_HIGH>;
+	};
 };
 
 &refclk {