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vaapipostproc: Enable to use DMABuf mem at sink and src pad

Mengkejiergeli Ba requested to merge mkba/gstreamer:vaapi_dma into main

Add DMABuf mem at both sink and src pad for vaapipostproc caps which helps to apply DMABuf for more generic use cases: such as "! vaapih264dec ! video/x-raw(memory:DMABuf) ! vaapipostproc ! video/x-raw (memory:DMABuf) ! vaapih265enc" . Or other mem converions like from DMABuf to VASurface through vaapipostproc.

This patch is a portion from Junyan.He@intel.com, gstreamer-vaapi!393

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