drm/tests: helpers: Allow for a custom device struct to be allocated
The current helper to allocate a DRM device doesn't allow for any subclassing by drivers, which is going to be troublesome as we work on getting some kunit testing on atomic modesetting code. Let's use a similar pattern to the other allocation helpers by providing the structure size and offset as arguments. Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://lore.kernel.org/r/20221123-rpi-kunit-tests-v3-10-4615a663a84a@cerno.techSigned-off-by: Maxime Ripard <maxime@cerno.tech>
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