V4L/DVB (9181): S2API: Add support fot DTV_GUARD_INTERVAL and DTV_TRANSMISSION_MODE

Tuning DVB-T via the S2API was failing, missing some essential items.

Signed-off-by: Steven Toth <stoth@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 6675edf..5578fba 100644
--- a/include/linux/dvb/frontend.h
+++ b/include/linux/dvb/frontend.h
@@ -271,8 +271,10 @@
 #define DTV_API_VERSION				35
 #define DTV_CODE_RATE_HP			36
 #define DTV_CODE_RATE_LP			37
+#define DTV_GUARD_INTERVAL			38
+#define DTV_TRANSMISSION_MODE			39
 
-#define DTV_MAX_COMMAND				DTV_CODE_RATE_LP
+#define DTV_MAX_COMMAND				DTV_TRANSMISSION_MODE
 
 typedef enum fe_pilot {
 	PILOT_ON,