virgl: Use minigbm_create_default_device helper to create gbm device

Yi Xie requested to merge yixie/virglrenderer:master into master

Applies only when ENABLE_MINIGBM_ALLOCATION is defined.

The helper was added in It looks for a DRM primary node when no render node can be found, making virgl work through llvmpipe on drivers with only a primary node, for example vkms.

Signed-off-by: Yi Xie

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