snowball: Adding config flag for device tree support

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
diff --git a/include/configs/snowball.h b/include/configs/snowball.h
index 30f4a4e..c5321dc 100644
--- a/include/configs/snowball.h
+++ b/include/configs/snowball.h
@@ -201,7 +201,7 @@
 
 #define CONFIG_SYS_HUSH_PARSER		1
 #define CONFIG_CMDLINE_EDITING
-
+#define CONFIG_OF_LIBFDT		1
 #define CONFIG_SETUP_MEMORY_TAGS	2
 #define CONFIG_INITRD_TAG		1
 #define CONFIG_CMDLINE_TAG		1	/* enable passing of ATAGs  */