nvramcui: reboot at the end as TODO suggests

Use cf9 to reboot at the end.

Change-Id: I642a5ec89c864fb03bbcdf6e4fcbb1e28f3fc34c
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4693
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

payloads/nvramcui/nvramcui.c

@@ -247,7 +247,8 @@ int main()
 	unpost_form(form);
 	free_form(form);
 
-	/* TODO: reboot */
+	/* reboot */
+	outb (0x6, 0xcf9);
 	halt();
 }