drm/i915: Silence the change of LVDS sync polarity

drm/i915: Silence the change of LVDS sync polarity

When the change to start adjusting the sync polarity of the LVDS mode
was introduced in

commit 54635cf66f250ef1a247ba6cc0185b1a31509c8f
Author: Bryan Freed <bfreed@google.com>
Date:   Wed Jan 12 13:43:19 2011 -0800

    drm/i915: Honour LVDS sync polarity from EDID

we made the change in state verbose so that we could quickly spot any
regressions that made have also been introduced with it. As there do not
appear to have been any, remove the extra logging.

v2: Remove the no longer used variables.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>