V4L/DVB (8998): s2api: restore DTV_UNDEFINED

Signed-off-by: Steven Toth <stoth@linuxtv.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/include/linux/dvb/frontend.h b/include/linux/dvb/frontend.h
index bfd670f..915edd3 100644
--- a/include/linux/dvb/frontend.h
+++ b/include/linux/dvb/frontend.h
@@ -251,6 +251,7 @@
  * binary compatability.
  */
 typedef enum dtv_cmd_types {
+	DTV_UNDEFINED,
 	DTV_TUNE,
 	DTV_CLEAR,