arm: at91/configs: add bootz to configuration

Support to boot zImage

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
[Add bootz 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/at91sam9rlek.h b/include/configs/at91sam9rlek.h
index be084b2..aa359b1 100644
--- a/include/configs/at91sam9rlek.h
+++ b/include/configs/at91sam9rlek.h
@@ -48,6 +48,7 @@
 
 #define CONFIG_DISPLAY_CPUINFO
 
+#define CONFIG_CMD_BOOTZ
 #define CONFIG_OF_LIBFDT
 
 #define CONFIG_ATMEL_LEGACY