Change "VERSION*" to more determined name "CBFS_HEADER_VERSION*".

The 'VERSION' in CBFS header file is confusing and may conflict when being used
in libpayload.

Change-Id: I24cce0cd73540e38d96f222df0a65414b16f6260
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: http://review.coreboot.org/2098
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>

util/nvramtool/cbfs.h

@@ -89,7 +89,7 @@ typedef uint8_t u8;
 
 #define CBFS_HEADER_MAGIC  0x4F524243
 #define CBFS_HEADPTR_ADDR 0xFFFFFFFc
-#define VERSION1 0x31313131
+#define CBFS_HEADER_VERSION1 0x31313131
 
 struct cbfs_header {
 	u32 magic;