imx: ventana: config: add USB Mass Storage (ums) support

Add support for the USB mass storage gadget to enable access to on-board
storage.

Example:
 Ventana > ums 0 mmc 0 # provide ums access to the uSD
 Ventana > ums 0 usb 0 # provide ums access to the first USB device
 Ventana > ums 0 sata 0 # provide ums access to an mSATA device

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

include/configs/gw_ventana.h

@@ -203,6 +203,18 @@
 #define CONFIG_NETCONSOLE
 #define CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP
 
+/* USB Mass Storage Gadget */
+#define CONFIG_USB_GADGET
+#define CONFIG_CMD_USB_MASS_STORAGE
+#define CONFIG_USB_GADGET_MASS_STORAGE
+#define CONFIG_USBDOWNLOAD_GADGET
+#define CONFIG_USB_GADGET_VBUS_DRAW    2
+
+/* Netchip IDs */
+#define CONFIG_G_DNL_VENDOR_NUM 0x0525
+#define CONFIG_G_DNL_PRODUCT_NUM 0xa4a5
+#define CONFIG_G_DNL_MANUFACTURER "Gateworks"
+
 /* Framebuffer and LCD */
 #define CONFIG_VIDEO
 #define CONFIG_VIDEO_IPUV3