smpte: remove unused fields

Remove the fields - format and fps from smpte
as they are unused.

https://bugzilla.gnome.org/show_bug.cgi?id=747597

gst/smpte/gstsmpte.h

@@ -61,10 +61,8 @@ struct _GstSMPTE {
   gboolean       invert;
 
   /* negotiated format */
-  gint           format;
   gint           width;
   gint           height;
-  gdouble        fps;
   gint           fps_num;
   gint           fps_denom;
   GstVideoInfo   vinfo1;