drm: Document how to register devices without struct drm_bus
With the recent addition of the drm_set_unique() function, devices can now be registered without requiring a drm_bus. Add a brief description to the DRM docbook to show how that can be achieved. Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: NThierry Reding <treding@nvidia.com>
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