drm/atomic-helper: Don't set deadline for modesets

If the crtc is being switched on or off then the semantics of
computing the timestampe of the next vblank is somewhat ill-defined.
And indeed, the code splats with a warning in the timestamp
computation code. Specifically it hits the check to make sure that
atomic drivers have full set up the timing constants in the drm_vblank
structure, and that's just not the case before the crtc is actually
on.

For robustness it seems best to just not set deadlines for modesets.

v2: Also skip on inactive crtc (Ville)

Link: https://lore.kernel.org/dri-devel/[email protected]/
Fixes: d39e48ca80c0 ("drm/atomic-helper: Set fence deadline for vblank")
Cc: Ville Syrjälä <[email protected]>
Cc: Rob Clark <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Reported-by: Dmitry Baryshkov <[email protected]>
Tested-by: Dmitry Baryshkov <[email protected]> # test patch only
Cc: Dmitry Baryshkov <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Reviewed-by: Rob Clark <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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