[media] DocBook: Better organize media devices

Instead of putting all media devices on a flat structure,
split them on 4 types, just like we do with the userspace API:
	Video2Linux devices
	Digital TV (DVB) devices
	Remote Controller devices
	Media Controller devices
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Acked-by: Jonathan Corbet <corbet@lwn.net>

Documentation/DocBook/device-drivers.tmpl

@@ -218,25 +218,34 @@ X!Isound/sound_firmware.c
 
   <chapter id="mediadev">
      <title>Media Devices</title>
-!Iinclude/media/media-device.h
-!Iinclude/media/media-devnode.h
-!Iinclude/media/media-entity.h
+
+     <sect1><title>Video2Linux devices</title>
 !Iinclude/media/v4l2-async.h
+!Iinclude/media/v4l2-ctrls.h
+!Iinclude/media/v4l2-dv-timings.h
+!Iinclude/media/v4l2-event.h
 !Iinclude/media/v4l2-flash-led-class.h
+!Iinclude/media/v4l2-mediabus.h
 !Iinclude/media/v4l2-mem2mem.h
 !Iinclude/media/v4l2-of.h
 !Iinclude/media/v4l2-subdev.h
-!Iinclude/media/rc-core.h
+!Iinclude/media/videobuf2-core.h
+!Iinclude/media/videobuf2-memops.h
+     </sect1>
+     <sect1><title>Digital TV (DVB) devices</title>
 !Idrivers/media/dvb-core/dvb_ca_en50221.h
 !Idrivers/media/dvb-core/dvb_frontend.h
 !Idrivers/media/dvb-core/dvb_math.h
 !Idrivers/media/dvb-core/dvb_ringbuffer.h
-!Iinclude/media/v4l2-ctrls.h
-!Iinclude/media/v4l2-event.h
-!Iinclude/media/v4l2-dv-timings.h
-!Iinclude/media/videobuf2-core.h
-!Iinclude/media/videobuf2-memops.h
-!Iinclude/media/v4l2-mediabus.h
+     </sect1>
+     <sect1><title>Remote Controller devices</title>
+!Iinclude/media/rc-core.h
+     </sect1>
+     <sect1><title>Media Controller devices</title>
+!Iinclude/media/media-device.h
+!Iinclude/media/media-devnode.h
+!Iinclude/media/media-entity.h
+     </sect1>
 
   </chapter>