drm/i915: Update less state during modeset.
No need to repeatedly call update_watermarks, or update_fbc. Down to a single call to update_watermarks in .crtc_enable Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com> Reviewed-by: NMatt Roper <matthew.d.roper@intel.com> Tested-by(IVB): Matt Roper <matthew.d.roper@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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