drm/atomic-helper: Add a TV properties reset helper

The drm_tv_create_properties() function will create a bunch of properties,
but it's up to each and every driver using that function to properly reset
the state of these properties leading to inconsistent behaviours.

Let's create a helper that will take care of it.

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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