Atmel: sam9g10/9m10/9x5: Add support to boot DT kernel

The mainline linux kernel is moving to flatten device tree support
Add the CONFIG_OF_LIBFDT option to support booting DT linux kernel

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

include/configs/at91sam9261ek.h

@@ -48,6 +48,8 @@
 
 #define CONFIG_DISPLAY_CPUINFO
 
+#define CONFIG_OF_LIBFDT
+
 #define CONFIG_ATMEL_LEGACY
 #define CONFIG_SYS_TEXT_BASE		0x21f00000
 

include/configs/at91sam9m10g45ek.h

@@ -47,6 +47,8 @@
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_DISPLAY_CPUINFO
 
+#define CONFIG_OF_LIBFDT
+
 /* general purpose I/O */
 #define CONFIG_ATMEL_LEGACY		/* required until (g)pio is fixed */
 #define CONFIG_AT91_GPIO

include/configs/at91sam9x5ek.h

@@ -42,6 +42,8 @@
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_DISPLAY_CPUINFO
 
+#define CONFIG_OF_LIBFDT
+
 /* general purpose I/O */
 #define CONFIG_ATMEL_LEGACY		/* required until (g)pio is fixed */
 #define CONFIG_AT91_GPIO