ARM64: dts: marvell: armada-37xx: Add USB2 node

Armada 37xx SoC embedded an EHCI controller. This patch adds the device
tree node enabling its support.
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/arm64/boot/dts/marvell/armada-3720-db.dts

@@ -116,6 +116,12 @@ &pcie0 {
 	status = "okay";
 };
 
+/* CON27 */
+&usb2 {
+	status = "okay";
+};
+
+
 &mdio {
 	status = "okay";
 	phy0: ethernet-phy@0 {

arch/arm64/boot/dts/marvell/armada-37xx.dtsi

@@ -200,6 +200,13 @@ usb3: usb@58000 {
 				status = "disabled";
 			};
 
+			usb2: usb@5e000 {
+				compatible = "marvell,armada-3700-ehci";
+				reg = <0x5e000 0x2000>;
+				interrupts = <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;
+				status = "disabled";
+			};
+
 			xor@60900 {
 				compatible = "marvell,armada-3700-xor";
 				reg = <0x60900 0x100