[Bug 763799] alsasrc: should not always assume that 8 channels implies 7.1 setup

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763799

--- Comment #4 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 324451
  --> https://bugzilla.gnome.org/attachment.cgi?id=324451&action=edit
alsa: properly convert position-less channels from ALSA

The only way for ALSA to expose a position-less multi channels is to
return an array full of SND_CHMAP_MONO. Converting this to a
GST_AUDIO_CHANNEL_POSITION_MONO array would be invalid as
GST_AUDIO_CHANNEL_POSITION_MONO is meant to be used only with one
channel.

Fix this by using GST_AUDIO_CHANNEL_POSITION_NONE which is meant to be
used for position-less channels.

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