[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>

Documentation/DocBook/media/dvb/dvbproperty.xml

@@ -821,6 +821,7 @@ typedef enum fe_hierarchy {
 	<programlisting>
 enum fe_interleaving {
 	INTERLEAVING_NONE,
+	INTERLEAVING_AUTO,
 	INTERLEAVING_240,
 	INTERLEAVING_720,
 };

include/linux/dvb/frontend.h

@@ -222,6 +222,7 @@ typedef enum fe_hierarchy {
 
 enum fe_interleaving {
 	INTERLEAVING_NONE,
+	INTERLEAVING_AUTO,
 	INTERLEAVING_240,
 	INTERLEAVING_720,
 };