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va: allocator: add vaCopy path for memory copy

Víctor Manuel Jáquez Leal requested to merge vjaquez/gstreamer:gst-plugins-bad-va-allocator-vacopy into main

Copied from https://gitlab.freedesktop.org//gstreamer/gst-plugins-bad/-/merge_requests/2176

libva 2.12 adds vaCopy() which can copy surfaces without mapping their contents onto main memory, that might be more efficient in certain situations.

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