tests: va: fix vapostproc test for DMABuf
Now it picks the first format in the template srcpad list and do the convertion. Also the format size is reduced because not all drives support 4K as DMABuf (radeonsi).
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Now it picks the first format in the template srcpad list and do the convertion. Also the format size is reduced because not all drives support 4K as DMABuf (radeonsi).