do_reset: unify duplicate prototypes

The duplication of the do_reset prototype has gotten out of hand,
and they're not all in sync.  Unify them all in command.h.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/board/funkwerk/vovpn-gw/vovpn-gw.c b/board/funkwerk/vovpn-gw/vovpn-gw.c
index e856ada..a4bfbc9 100644
--- a/board/funkwerk/vovpn-gw/vovpn-gw.c
+++ b/board/funkwerk/vovpn-gw/vovpn-gw.c
@@ -306,7 +306,7 @@
 
 #if defined(CONFIG_HAVE_OWN_RESET)
 int
-do_reset (void *cmdtp, int flag, int argc, char * const argv[])
+do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	volatile ioport_t *iop;