imx: ventana: fix USB hub reset

Remove board_ehci_hcd_init function that is not used with DM_USB
and replace its functionality with device-tree configuraton that treats
USB HUB RST# as a gpio enable for the usbh1 vbus regulator.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/arch/arm/dts/imx6qdl-gw560x.dtsi b/arch/arm/dts/imx6qdl-gw560x.dtsi
index 5da1975..1e95267 100644
--- a/arch/arm/dts/imx6qdl-gw560x.dtsi
+++ b/arch/arm/dts/imx6qdl-gw560x.dtsi
@@ -221,7 +221,8 @@
 		regulator-name = "usb_h1_vbus";
 		regulator-min-microvolt = <5000000>;
 		regulator-max-microvolt = <5000000>;
-		regulator-always-on;
+		gpio = <&gpio1 9 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
 	};
 
 	reg_usb_otg_vbus: regulator-usb-otg-vbus {