[Bug 757152] opus: Add proper multichannel support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757152

--- Comment #30 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 314762
  --> https://bugzilla.gnome.org/attachment.cgi?id=314762&action=edit
matroskademux: Use codecutils helpers for creating Opus caps

Also fix up codec data with values from the container.

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