media: dvb header files: move some headers to staging

The audio, video and OSD APIs are used upstream only by the
av7110 driver, which was moved to staging.

So, move the corresponding header files to it.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/av7110/av7110.h

@@ -9,11 +9,12 @@
 #include <linux/input.h>
 #include <linux/time.h>
 
-#include <linux/dvb/video.h>
-#include <linux/dvb/audio.h>
+#include "video.h"
+#include "audio.h"
+#include "osd.h"
+
 #include <linux/dvb/dmx.h>
 #include <linux/dvb/ca.h>
-#include <linux/dvb/osd.h>
 #include <linux/dvb/net.h>
 #include <linux/mutex.h>