nitrogen6x: config: add USB Mass Storage (ums) support

Add support for the USB mass storage to enable access to on-board
storage (especially eMMC and SATA).

Details at:
        http://boundarydevices.com/u-boot-usb-mass-storage-gadget/

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>

include/configs/nitrogen6x.h

@@ -368,4 +368,17 @@
 #define CONFIG_PCIE_IMX
 #endif
 
+#define CONFIG_CMD_ELF
+
+#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 "Boundary"
+
 #endif	       /* __CONFIG_H */