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venus: defer qfb buffer init upon query being used

Yiwei Zhang requested to merge zzyiwei/mesa:vn-qfb-lazy-alloc into main

What does this MR do and why?

venus: defer qfb buffer init upon query being used

Previously the qfb mem alloc can exceed open fd limit, failing the
renderer side blob mem export.

Fixes: c97f9193ef5 ("venus: drop internal memory pools")
Signed-off-by: Yiwei Zhang <zzyiwei@chromium.org>

/cc @ryanneph @justonli this is the exact reviewed change

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