imx: ventana: remove hard-coded USB OTG pinmux

pinmux is now done via dt. Add missing OTG_OC pinmux for boards that
use it.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/arch/arm/dts/imx6qdl-gw553x.dtsi b/arch/arm/dts/imx6qdl-gw553x.dtsi
index e21f068..b15c281 100644
--- a/arch/arm/dts/imx6qdl-gw553x.dtsi
+++ b/arch/arm/dts/imx6qdl-gw553x.dtsi
@@ -688,6 +688,7 @@
 		fsl,pins = <
 			MX6QDL_PAD_GPIO_1__USB_OTG_ID		0x17059
 			MX6QDL_PAD_EIM_D22__GPIO3_IO22		0x1b0b0 /* OTG_PWR_EN */
+			MX6QDL_PAD_KEY_COL4__USB_OTG_OC		0x17059
 		>;
 	};