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plugins: postproc: Fix a problem of propose_allocation when passthrough.

He Junyan requested to merge He_Junyan/gstreamer-vaapi:postproc_passthough into master

We should query the downstream element to answer a precise allocation query when the passthrough mode is enabled. The current way still decides the allocation by the postproc itself. The pipeline such as: gst-launch-1.0 -v filesrc location=xxx.264 ! h264parse ! vaapih264dec !
vaapipostproc ! fakevideosink silent=false sync=true will lose some info such as the GST_VIDEO_META_API_TYPE.

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