ppc4xx: Add PPC405EX support

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/asm-ppc/u-boot.h b/include/asm-ppc/u-boot.h
index 464f6b5..bd9b6f7 100644
--- a/include/asm-ppc/u-boot.h
+++ b/include/asm-ppc/u-boot.h
@@ -84,6 +84,7 @@
     defined(CONFIG_405CR) || \
     defined(CONFIG_405EP) || \
     defined(CONFIG_405EZ) || \
+    defined(CONFIG_405EX) || \
     defined(CONFIG_440)
 	unsigned char	bi_s_version[4];	/* Version of this structure */
 	unsigned char	bi_r_version[32];	/* Version of the ROM (AMCC) */