wip: omxvideoenc: pass offset and stride details to ALLOCATION query

Closed Guillaume Desmottes requested to merge gdesmott/gst-omx:alig-negot-master into master

By passing the expected video buffer layout, the upstream producer may be able to produce buffers fitting those requierements allowing gst-omx to use dynamic buffer mode rather than having to copy each input buffer.

This is particularly useful with v4l2src as it can request the capture driver to produce buffers with the requiered paddings.

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