colibri_imx6: remove obsolete USB_GADGET_MASS_STORAGE configuration

Remove obsolete USB_GADGET_MASS_STORAGE configuration.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
diff --git a/include/configs/colibri_imx6.h b/include/configs/colibri_imx6.h
index 9e45d63..f029a88 100644
--- a/include/configs/colibri_imx6.h
+++ b/include/configs/colibri_imx6.h
@@ -70,8 +70,6 @@
 /* Client */
 #define CONFIG_USBD_HS
 
-#define CONFIG_USB_GADGET_MASS_STORAGE
-
 /* Framebuffer and LCD */
 #define CONFIG_VIDEO_IPUV3
 #define CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE