configs: libretech-ac: Enable USB gadget with Mass Storage function

Enable configs to support USB gadget and Mass Storage
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>

configs/libretech-ac_defconfig

@@ -27,6 +27,7 @@ CONFIG_CMD_MMC=y
 CONFIG_CMD_SF_TEST=y
 CONFIG_CMD_SPI=y
 CONFIG_CMD_USB=y
+CONFIG_CMD_USB_MASS_STORAGE=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_REGULATOR=y
 CONFIG_OF_CONTROL=y
@@ -69,6 +70,12 @@ CONFIG_USB_XHCI_DWC3=y
 CONFIG_USB_XHCI_DWC3_OF_SIMPLE=y
 CONFIG_USB_DWC3=y
 CONFIG_USB_KEYBOARD=y
+# CONFIG_USB_DWC3_GADGET is not set
+CONFIG_USB_GADGET=y
+CONFIG_USB_GADGET_VENDOR_NUM=0x1b8e
+CONFIG_USB_GADGET_PRODUCT_NUM=0xfada
+CONFIG_USB_GADGET_DWC2_OTG=y
+CONFIG_USB_GADGET_DOWNLOAD=y
 CONFIG_DM_VIDEO=y
 # CONFIG_VIDEO_BPP8 is not set
 # CONFIG_VIDEO_BPP16 is not set