Revert "[media] dvb/audio.h: Remove definition for AUDIO_GET_PTS"

Based on those feedback:
	http://www.spinics.net/lists/linux-media/msg33704.html
	http://www.spinics.net/lists/linux-media/msg33700.html

I'm reverting the removal of this unused ioctl, as it seems that some
drivers under development may be using. So, I'll wait until the next
merge window before removing those unused ioctls, to give a chance for
developers to submit their pending work.

This reverts commit db48923da6c528d461b5e764692239eb9c1b7a00.

Cc: Andreas Oberritter <obi@linuxtv.org>
Cc: Manu Abraham <abraham.manu@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

include/linux/dvb/audio.h

@@ -118,6 +118,18 @@ typedef __u16 audio_attributes_t;
 #define AUDIO_SET_ATTRIBUTES       _IOW('o', 17, audio_attributes_t)
 #define AUDIO_SET_KARAOKE          _IOW('o', 18, audio_karaoke_t)
 
+/**
+ * AUDIO_GET_PTS
+ *
+ * Read the 33 bit presentation time stamp as defined
+ * in ITU T-REC-H.222.0 / ISO/IEC 13818-1.
+ *
+ * The PTS should belong to the currently played
+ * frame if possible, but may also be a value close to it
+ * like the PTS of the last decoded frame or the last PTS
+ * extracted by the PES parser.
+ */
+#define AUDIO_GET_PTS              _IOR('o', 19, __u64)
 #define AUDIO_BILINGUAL_CHANNEL_SELECT _IO('o', 20)
 
 #endif /* _DVBAUDIO_H_ */