drm/i915/ivb: Move WaCxSRDisabledForSpriteScaling w/a to atomic check

Determine whether we need to apply this workaround at atomic check time
and just set a flag that will be used by the main watermark update
routine.

Moving this workaround into the atomic framework reduces
ilk_update_sprite_wm() to just a standard watermark update, so drop it
completely and just ensure that ilk_update_wm() is called whenever a
sprite plane is updated in a way that would affect watermarks.

Signed-off-by: Matt Roper <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Smoke-tested-by: Paulo Zanoni <[email protected]>
Link: http://patchwork.freedesktop.org/patch/60367/

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