[Bug 764316] vaapidecode: simplify downstream negotiation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764316
Bug 764316 depends on bug 764421, which changed state.

Bug 764421 Summary: libs: (audio,video) split allocation query caps and pad caps
https://bugzilla.gnome.org/show_bug.cgi?id=764421

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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