drm/atomic-helper: Don't call atomic_update_plane when it stays off

It's a silly thing to do and surprises driver writers. Most likely
this did already blow up for exynos.

It's also a silly thing to change plane state when it's off, but fbdev
is silly (it does an unconditional modeset over all planes). And
userspace can be evil. So I think we need this.

With this check in the helpers we can remove the one in i915 code for
the same conditions (becuase ->crtc iff ->fb).

Cc: Gustavo Padovan <[email protected]>
Cc: [email protected]
Cc: Inki Dae <[email protected]>
Cc: Matt Roper <[email protected]>
Acked-by: Laurent Pinchart <[email protected]>
Tested-by: Laurent Pinchart <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

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