LF-320-2 ARM: imx_v6_v7_defconfig: add some missing USB configurations

- Two USB certification configuration
i.MX customers need one Image for both USB certification and production,
add USB certification configurations will not affect normal functions.

- CONFIG_EXTCON_USB_GPIO
Align with v4.19 kernel, some old boards uses this configurations.

Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>

arch/arm/configs/imx_v6_v7_defconfig

@@ -376,8 +376,10 @@ CONFIG_SND_SIMPLE_CARD=y
 CONFIG_HID_MULTITOUCH=y
 CONFIG_USB=y
 CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
+CONFIG_USB_OTG_WHITELIST=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_EHCI_MXC=y
+CONFIG_USB_HCD_TEST_MODE=y
 CONFIG_USB_ACM=m
 CONFIG_USB_STORAGE=y
 CONFIG_USB_CHIPIDEA=y
@@ -465,6 +467,7 @@ 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_IMX7D_ADC=y
 CONFIG_RN5T618_ADC=y