ARM: imx_v6_v7_defconfig: Enable USB GPIO extcon support

Enable USB GPIO extcon support aka CONFIG_EXTCON_USB_GPIO as e.g. used
on Colibri iMX6 and Colibri iMX7 for USB device/host role switching.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -397,6 +397,7 @@ CONFIG_CLK_IMX8MN=y
 CONFIG_CLK_IMX8MP=y
 CONFIG_CLK_IMX8MQ=y
 CONFIG_SOC_IMX8M=y
+CONFIG_EXTCON_USB_GPIO=y
 CONFIG_IIO=y
 CONFIG_MMA8452=y
 CONFIG_IMX7D_ADC=y