arm64: mvebu: Armada 3700: Add USB device tree nodes

This patch adds the USB device tree nodes that are still missing to
the Armada 3700 dts files.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Nadav Haklai <nadavh@marvell.com>
Cc: Kostya Porotchkin <kostap@marvell.com>
Cc: Wilson Ding <dingwei@marvell.com>
Cc: Victor Gu <xigu@marvell.com>
Cc: Hua Jing <jinghua@marvell.com>
Cc: Terry Zhou <bjzhou@marvell.com>
Cc: Hanna Hawa <hannah@marvell.com>
Cc: Haim Boot <hayim@marvell.com>

arch/arm/dts/armada-3720-db.dts

@@ -112,6 +112,11 @@
 	status = "okay";
 };
 
+/* CON29 */
+&usb2 {
+	status = "okay";
+};
+
 /* CON31 */
 &usb3 {
 	status = "okay";

arch/arm/dts/armada-37xx.dtsi

@@ -114,6 +114,12 @@
 				status = "disabled";
 			};
 
+			usb2: usb@5e000 {
+				compatible = "marvell,armada3700-ehci";
+				reg = <0x5e000 0x450>;
+				status = "disabled";
+			};
+
 			xor@60900 {
 				compatible = "marvell,armada-3700-xor";
 				reg = <0x60900 0x100