mx5: Select CONFIG_REVISION_TAG

FSL 2.6.35 kernel expects that revision tag is passed by the bootloader.

Select CONFIG_REVISION_TAG so that mx53 boards can work properly with 2.6.35.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
diff --git a/include/configs/mx53smd.h b/include/configs/mx53smd.h
index 9e83319..942949d 100644
--- a/include/configs/mx53smd.h
+++ b/include/configs/mx53smd.h
@@ -34,6 +34,7 @@
 #define CONFIG_CMDLINE_TAG			/* enable passing of ATAGs */
 #define CONFIG_SETUP_MEMORY_TAGS
 #define CONFIG_INITRD_TAG
+#define CONFIG_REVISION_TAG
 
 /* Size of malloc() pool */
 #define CONFIG_SYS_MALLOC_LEN		(CONFIG_ENV_SIZE + 2 * 1024 * 1024)