imx: ventana: add usb_pcisel hwconfig support

The GW52xx has a MUX that can direct front-panel USB OTG to one of the
miniPCIe sockets (for use with a cellular modem for example). Use hwconfig
to steer this.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/board/gateworks/gw_ventana/gw_ventana.c b/board/gateworks/gw_ventana/gw_ventana.c
index dac79d1..51925d1 100644
--- a/board/gateworks/gw_ventana/gw_ventana.c
+++ b/board/gateworks/gw_ventana/gw_ventana.c
@@ -1111,7 +1111,9 @@
 
 	/* USBOTG Select (PCISKT or FrontPanel) */
 	if (gpio_cfg[board].usb_sel)
-		gpio_direction_output(gpio_cfg[board].usb_sel, 0);
+		gpio_direction_output(gpio_cfg[board].usb_sel,
+				      (hwconfig("usb_pcisel")) ? 1 : 0);
+
 
 	/* PCISKT_WDIS# (Wireless disable GPIO to miniPCIe sockets) */
 	if (gpio_cfg[board].wdis)