Add a canGrow argument to xf86InitialConfiguration.
canGrow indicates to the DDX that the driver can enlarge the desktop via the xf86_config->funcs->resize hook. If so, xf86InitialConfiguration will set virtual[XY] to match the configuration it chooses and will leave the crtc config size ranges alone. If FALSE, it will bloat the screen to fit the largest probed mode and also set the crtc config max size to limit the desktop to the initial virtual[XY] size.
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