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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #2 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 324422
  --> https://bugzilla.gnome.org/attachment.cgi?id=324422&action=edit
alsa: factor out alsa_detect_channels_mapping()

This code was duplicated in alsasrc and alsasink.

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