do_bootd: unify duplicate prototypes

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/include/command.h b/include/command.h
index 915be57..e98332e 100644
--- a/include/command.h
+++ b/include/command.h
@@ -95,6 +95,9 @@
 extern int cmd_get_data_size(char* arg, int default_size);
 #endif
 
+#ifdef CONFIG_CMD_BOOTD
+extern int do_bootd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
+#endif
 extern int do_bootm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
 
 #endif	/* __ASSEMBLY__ */