drm/vc4: tests: Add helper to add a new plane to a state
We'll start to add some tests for the plane state logic, so let's create
a helper to add a plane to an existing atomic state.
Signed-off-by: 
Maxime Ripard <maxime@cerno.tech>
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We'll start to add some tests for the plane state logic, so let's create
a helper to add a plane to an existing atomic state.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>