[Bug 763985] audio: add some debug output about channels mapping

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763985

--- Comment #3 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 324423
  --> https://bugzilla.gnome.org/attachment.cgi?id=324423&action=edit
gst-audio: add gst_audio_channel_positions_to_string()

We currently don't log much about channel positions making debugging
harder as it should be. This is the first step in my attempt to improve
this.

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