[C31] add regulator for usb hub reset

Add regulator that keeps usb hub reset signal low

arch/arm64/boot/dts/seco/seco-rk3399-c31.dtsi

@@ -144,6 +144,18 @@ vcca1v8_run: vcca1v8-run {
 		vin-supply = <&vcc3v3_sys>;
 	};
 
+	usb2_hub_host: usb2-hub-host {
+		compatible              = "regulator-fixed";
+		gpio                    = <&gpio1 RK_PA2 GPIO_ACTIVE_HIGH>;
+		pinctrl-names           = "default";
+		pinctrl-0               = <&host_hub_enable>;
+		regulator-name          = "usb2_hub_host";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		enable-active-down;
+		regulator-always-on;
+	};
+
 	sdio_pwrseq: sdio-pwrseq {
 		compatible = "mmc-pwrseq-sd8997";
 		clocks = <&rk808 1>;
@@ -1006,6 +1018,13 @@ vcc5v0_host_usb3_en: vcc5v0-host-usb3-en {
 		};
 	};
 
+	usb2 {
+		host_hub_enable: host-vbus-drv {
+			rockchip,pins =
+				<1 RK_PA2 RK_FUNC_GPIO &pcfg_pull_up>;
+		};
+	};
+
 	usb_typec_en {
 		vcc5v0_typec0_en: vcc5v0-typec0-en {
 			rockchip,pins = <0 RK_PA4 RK_FUNC_GPIO &pcfg_pull_none>;