drm/i915: Plumb the entire atomic state into intel_color_check()

Bunch of stuff in intel_color_check() needs to look at both the
old and new crtc states. Currently we do that by digging the
full atomic state via the crtc_state->state pointer. That thing
is a total footgun if I ever saw one, as it's only valid during
specific parts of the atomic flow. A lot of people have been
bitten by this thing in the past when trying to use it after
it's no longer valid.

Take a small step towards elimination of the footgun by not
using it in the inte_color_check(). Instead we plumb in the
entire atomic state all the way from the top.

Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Jani Nikula <[email protected]>

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