arm: at91/configs: add libfdt to configuration

support to boot device tree Linux kernel

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
[Add libftd for at91rm9200, at91sam9263, at91sam9rl]
Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/include/configs/at91sam9263ek.h b/include/configs/at91sam9263ek.h
index 3503822..005d1af 100644
--- a/include/configs/at91sam9263ek.h
+++ b/include/configs/at91sam9263ek.h
@@ -62,6 +62,8 @@
 
 #define CONFIG_DISPLAY_CPUINFO
 
+#define CONFIG_OF_LIBFDT
+
 /*
  * Hardware drivers
  */