mv-common.h: Include support for device trees

Signed-off-by: Kevin Smith <kevin.smith@elecsyscorp.com>
Acked-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/mv-common.h b/include/configs/mv-common.h
index 0d7b34b..b654fff 100644
--- a/include/configs/mv-common.h
+++ b/include/configs/mv-common.h
@@ -59,6 +59,8 @@
 #define CONFIG_BOOTDELAY	3	/* default enable autoboot */
 #define CONFIG_PREBOOT
 
+#define CONFIG_OF_LIBFDT		/* Device tree support */
+
 /*
  * For booting Linux, the board info and command line data
  * have to be in the first 8 MB of memory, since this is