stub 'time' command; OK miod

octeon (like loongson at least) lacks clock code and thus the 'time'
command besides MD boot* manuals.

Since unsupported commands are treated as file names and explicit
kernels overrule any /bsd.{boot,upgrade} fallback in general,
this causes sysupgrade to not kick in until boot.conf is fixed:

	>> OpenBSD/octeon BOOT 1.5
	upgrade detected: switching to /bsd.upgrade
	failed to load kernel sd0a:time: No such file or directory
	will try /bsd
	boot>
	NOTE: random seed is being reused.
	booting sd0a:/bsd

Make 'time' do nothing and return success to ensure it doesn't effect
subsequent execution.

sys/arch/octeon/stand/rdboot/cmd.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: cmd.c,v 1.6 2025/08/23 16:48:17 gkoehler Exp $	*/
+/*	$OpenBSD: cmd.c,v 1.7 2026/01/18 07:54:36 kn Exp $	*/
 
 /*
  * Copyright (c) 1997-1999 Michael Shalayeff
@@ -48,6 +48,7 @@ static int Xhelp(void);
 static int Xls(void);
 static int Xnop(void);
 static int Xreboot(void);
+static int Xtime(void);
 #ifdef MACHINE_CMD
 static int Xmachine(void);
 extern const struct cmd_table MACHINE_CMD[];
@@ -70,6 +71,7 @@ const struct cmd_table cmd_table[] = {
 #endif
 	{"reboot", CMDT_CMD, Xreboot},
 	{"set",    CMDT_SET, Xset},
+	{"time",   CMDT_CMD, Xtime},
 	{NULL, 0},
 };
 
@@ -493,6 +495,12 @@ Xreboot(void)
 	return 0; /* just in case */
 }
 
+static int
+Xtime(void)
+{
+	return 0;
+}
+
 int
 upgrade(void)
 {

sys/arch/octeon/stand/rdboot/rdboot.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: rdboot.c,v 1.10 2025/08/23 16:48:17 gkoehler Exp $	*/
+/*	$OpenBSD: rdboot.c,v 1.11 2026/01/18 07:54:36 kn Exp $	*/
 
 /*
  * Copyright (c) 2019-2020 Visa Hankala
@@ -51,7 +51,7 @@ void	kexec(int);
 
 struct cmd_state cmd;
 int octbootfd = -1;
-const char version[] = "1.5";
+const char version[] = "1.6";
 
 int
 main(void)