dm646x: pass board revision info to kernel

add a function in board file to pass board revision
info to kernel. Revision number 0 and 1 are passed in
case of DM6467 and DM6467T respectively.

Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
diff --git a/include/configs/davinci_dm6467evm.h b/include/configs/davinci_dm6467evm.h
index ec1c31c..c9a0cd1 100644
--- a/include/configs/davinci_dm6467evm.h
+++ b/include/configs/davinci_dm6467evm.h
@@ -65,6 +65,7 @@
 #define CONFIG_SETUP_MEMORY_TAGS
 #define CONFIG_SYS_BARGSIZE		1024		/* Bootarg Size */
 #define CONFIG_SYS_LOAD_ADDR		0x80700000	/* kernel address */
+#define CONFIG_REVISION_TAG
 
 /* Serial Driver info */
 #define CONFIG_SYS_NS16550