platforms/drm: do not try to use the GPU card node
On some devices, the GPU nodes are also added as /dev/dri/cardX, they are not useful for KMS purposes and does not have display resources. If we encounter such cards, then skip them.
On some devices, the GPU nodes are also added as /dev/dri/cardX, they are not useful for KMS purposes and does not have display resources. If we encounter such cards, then skip them.