ot1200: enable support for USB_STORAGE

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
diff --git a/include/configs/ot1200.h b/include/configs/ot1200.h
index 0d0873d..255c933 100644
--- a/include/configs/ot1200.h
+++ b/include/configs/ot1200.h
@@ -85,6 +85,7 @@
 
 /* USB Configs */
 #define CONFIG_CMD_USB
+#define CONFIG_USB_STORAGE
 #define CONFIG_USB_EHCI
 #define CONFIG_USB_EHCI_MX6
 #define CONFIG_MXC_USB_PORTSC   (PORT_PTS_UTMI | PORT_PTS_PTW)