examples: don't force an specific audio sink
examples: don't force an specific audio sink

Let playbin2 choose the audiosink available in the system.

freedesktop-unofficial-mirror/gstreamer__gst-omx,varunkumara/test-repo,changzhix/gst-omx,surround-io/gst-omx,xuguangxin/gst-omx,renesas-rcar/gst-omx,changzhix/gst-omx,tjormola/gst-omx,ismelykh/gst-omx-deinterlace,freedesktop-unofficial-mirror/gstreamer__gst-omx,varunkumara/test-repo,renesas-rcar/gst-omx,leio/gst-omx,01org/gst-omx,GStreamer/gst-omx,CapOM/gst-omx,surround-io/gst-omx,CapOM/gst-omx,RidgeRun/gst-omx,01org/gst-omx,ismelykh/gst-omx-deinterlace,tjormola/gst-omx,RidgeRun/gst-omx,GStreamer/gst-omx,CapOM/gst-omx,varunkumara/test-repo,xuguangxin/gst-omx,pliu6/gst-omx,renesas-rcar/gst-omx,pliu6/gst-omx,GStreamer/gst-omx,leio/gst-omx