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Now that we have a plane create helper for kunit mocked drivers, let's
convert to it in vc4.
Reviewed-by: Maíra Canal <mcanal@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240527-kms-hdmi-connector-state-v15-27-c5af16c3aae2@kernel.org

Signed-off-by: Maxime Ripard <mripard@kernel.org>