arm64: dts: imx8mm-venice-gw7901: add support for USB hub subload

The USB hub has it's reset as GPIO4_IO17 but can be sub-loaded and
VBUS provided by a VBUS regulator with GPIO4_IO2 as the enable and
GPIO1_IO15 as the active-low over-current.

Enable pull-up for GPIO4_IO17 to keep hub out of reset and move VBUS
enable to GPIO4_IO2. Additionally enable pull-up on GPIO1_IO15 so that
if the hub is loaded it never over-currents.

This allows USB to work in both configurations without a device-tree
change.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts

@@ -216,7 +216,7 @@
 		pinctrl-0 = <&pinctrl_reg_usb2>;
 		compatible = "regulator-fixed";
 		regulator-name = "usb_usb2_vbus";
-		gpio = <&gpio4 17 GPIO_ACTIVE_HIGH>;
+		gpio = <&gpio4 2 GPIO_ACTIVE_HIGH>;
 		enable-active-high;
 		regulator-min-microvolt = <5000000>;
 		regulator-max-microvolt = <5000000>;
@@ -822,8 +822,9 @@
 
 	pinctrl_reg_usb2: regusb1grp {
 		fsl,pins = <
-			MX8MM_IOMUXC_SAI1_TXD5_GPIO4_IO17	0x41
-			MX8MM_IOMUXC_GPIO1_IO15_USB2_OTG_OC	0x41
+			MX8MM_IOMUXC_SAI1_RXD0_GPIO4_IO2	0x41
+			MX8MM_IOMUXC_SAI1_TXD5_GPIO4_IO17	0x140
+			MX8MM_IOMUXC_GPIO1_IO15_USB2_OTG_OC	0x140
 		>;
 	};