arm64: dts: rockchip: add usb2-phy otg-port support for rk3399

Add otg-port nodes for both u2phy0 and u2phy1. The otg-port can
be used for USB2.0 part of USB3.0 OTG controller.
Signed-off-by: William Wu <wulf@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399.dtsi

@@ -1128,6 +1128,16 @@ u2phy0_host: host-port {
 				interrupt-names = "linestate";
 				status = "disabled";
 			};
+
+			u2phy0_otg: otg-port {
+				#phy-cells = <0>;
+				interrupts = <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH 0>,
+					     <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH 0>,
+					     <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH 0>;
+				interrupt-names = "otg-bvalid", "otg-id",
+						  "linestate";
+				status = "disabled";
+			};
 		};
 
 		u2phy1: usb2-phy@e460 {
@@ -1145,6 +1155,16 @@ u2phy1_host: host-port {
 				interrupt-names = "linestate";
 				status = "disabled";
 			};
+
+			u2phy1_otg: otg-port {
+				#phy-cells = <0>;
+				interrupts = <GIC_SPI 108 IRQ_TYPE_LEVEL_HIGH 0>,
+					     <GIC_SPI 109 IRQ_TYPE_LEVEL_HIGH 0>,
+					     <GIC_SPI 111 IRQ_TYPE_LEVEL_HIGH 0>;
+				interrupt-names = "otg-bvalid", "otg-id",
+						  "linestate";
+				status = "disabled";
+			};
 		};
 
 		emmc_phy: phy@f780 {