xf86platformProbeDev creates GPU screens for any platform devices that were not
matched by a GDev in the loop above, but only if there was at least one device.
This means that it's impossible to configure a device as a GPU screen if there
is only one platform device that matches that driver.
Instead, create a GPU screen (if possible) for any platform device that was not
claimed by the GDev loop.
Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@ubuntu.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
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