virtio-gpu: some edid clarifications

Add some notes about fetching the EDID information.

Fixes: https://github.com/oasis-tcs/virtio-spec/issues/64
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
1 file changed