[media] DVB API: add INTERLEAVING_AUTO

After thinking twice, I ended up adding own value for AUTO
interleaving instead of using NONE.

API minor number is not needed to increase as that patch should
be the same Kernel as interleaving parameter is initially added.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/include/linux/dvb/frontend.h b/include/linux/dvb/frontend.h
index 2dd5823..c92b4d6 100644
--- a/include/linux/dvb/frontend.h
+++ b/include/linux/dvb/frontend.h
@@ -222,6 +222,7 @@
 
 enum fe_interleaving {
 	INTERLEAVING_NONE,
+	INTERLEAVING_AUTO,
 	INTERLEAVING_240,
 	INTERLEAVING_720,
 };