drm/vc4: vec: Check for VEC output constraints

The VEC can accept pretty much any relatively reasonable mode, but still
has a bunch of constraints to meet.

Let's create an atomic_check() implementation that will make sure we
don't end up accepting a non-functional mode.

Acked-by: Noralf Trønnes <[email protected]>
Signed-off-by: Mateusz Kwiatkowski <[email protected]>
Tested-by: Mateusz Kwiatkowski <[email protected]>
Acked-in-principle-or-something-like-that-by: Daniel Vetter <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Maxime Ripard <[email protected]>

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