drm/atomic-helper: Add an analog TV atomic_check implementation

The analog TV connector drivers share some atomic_check logic, and the new
TV standard property have created some boilerplate that can be shared
across drivers too.

Let's create an atomic_check helper for those use cases.

Reviewed-by: Noralf Trønnes <[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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