rarp: Condtionally compile rarp support

Most people don't use the 'rarpboot' command, so only enable it when
CONFIG_CMD_RARP is defined.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/include/config_cmd_all.h b/include/config_cmd_all.h
index 746bf18..cdc5ff1 100644
--- a/include/config_cmd_all.h
+++ b/include/config_cmd_all.h
@@ -70,6 +70,7 @@
 #define CONFIG_CMD_PORTIO	/* Port I/O			*/
 #define CONFIG_CMD_REGINFO	/* Register dump		*/
 #define CONFIG_CMD_REISER	/* Reiserfs support		*/
+#define CONFIG_CMD_RARP		/* rarpboot support		*/
 #define CONFIG_CMD_RUN		/* run command in env variable	*/
 #define CONFIG_CMD_SAVEENV	/* saveenv			*/
 #define CONFIG_CMD_SAVES	/* save S record dump		*/