We'll need in some tests to control when the device needs to be added and removed, so let's split the device creation from the DRM device creation function. Reviewed-by: Maíra Canal <mcanal@igalia.com> Link: https://lore.kernel.org/r/20221123-rpi-kunit-tests-v3-7-4615a663a84a@cerno.tech Signed-off-by: Maxime Ripard <maxime@cerno.tech>