drm/vc4: Constify private state accessors

None of those helpers modify the pointed data, let's make them const.

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220328124304.2309418-4-maxime@cerno.tech
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Maxime Ripard 2022-03-28 14:43:03 +02:00
commit 220f125cd5
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