galaxy5200: enable version environment variable

Add version environment variable configuration to the galaxy5200
board header file.
Signed-off-by: NEric Millbrandt <emillbrandt@dekaresearch.com>

Edited commit message.
Signed-off-by: NWolfgang Denk <wd@denx.de>

include/configs/galaxy5200.h

@@ -367,6 +367,8 @@
 				 CONFIG_BOOTP_DNS2 | \
 				 CONFIG_BOOTP_SEND_HOSTNAME )
 
+#define CONFIG_VERSION_VARIABLE 1
+
 /*
  * Various low-level settings
  */