drm/i915: Drop a spurious intel_pre_plane_update() call

Kill the extra intel_pre_plane_update() I accidentally added in

 commit 852eb00dc44ea2b8896e2fa27c6a36a1f697ba5a
 Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
 Date:   Wed Jun 24 22:00:07 2015 +0300

    drm/i915: Try to make sure cxsr is disabled around plane
    enable/disable

This fixes a load of warnings from the frontbuffer tracking.

Testcase: igt/kms_frontbuffer_tracking/fbc-1p-rte
Tested-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Tested-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -13141,8 +13141,6 @@ static int __intel_set_mode(struct drm_atomic_state *state)
 		if (!needs_modeset(crtc->state))
 			continue;
 
-		intel_pre_plane_update(intel_crtc);
-
 		any_ms = true;
 		intel_pre_plane_update(intel_crtc);