[Bug 767222] audio: Fix gst_audio_channel_positions_to_mask annotations

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767222

--- Comment #4 from Thibault Saunier <tsaunier at gnome.org> ---
I think we were missing `(out caller-allocates)` but appart from that I believe
this is correct now, just opening the bug here so you check if I am right,
otherwise we should move it to gobject-introspection I think

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