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venus: workaround a false mappable size issue for blob_mem allocated from virtgpu_virgl backend with VIRTIO_GPU_NEXT

Yiwei Zhang requested to merge zzyiwei/mesa:blobmem-size into main

For blob_mem allocated from virtgpu_virgl backend, the guest mappable size queried can be smaller than the size returned from image memory requirement query from the host side. Here we temporarily workaround until we switch to use cross-domain backend in minigbm.

/cc @olv @ryanneph

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