drm/i915: Don't pass dev_priv to broxton_calc_cdclk()

broxton_calc_cdclk() doesn't need dev_priv for anything, so let's not
bother passing it around.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1462995892-32416-5-git-send-email-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/intel_display.c

@@ -5896,8 +5896,7 @@ static int valleyview_calc_cdclk(struct drm_i915_private *dev_priv,
 		return 200000;
 }
 
-static int broxton_calc_cdclk(struct drm_i915_private *dev_priv,
-			      int max_pixclk)
+static int broxton_calc_cdclk(int max_pixclk)
 {
 	/*
 	 * FIXME:
@@ -5965,16 +5964,15 @@ static int valleyview_modeset_calc_cdclk(struct drm_atomic_state *state)
 static int broxton_modeset_calc_cdclk(struct drm_atomic_state *state)
 {
 	struct drm_device *dev = state->dev;
-	struct drm_i915_private *dev_priv = dev->dev_private;
 	int max_pixclk = intel_mode_max_pixclk(dev, state);
 	struct intel_atomic_state *intel_state =
 		to_intel_atomic_state(state);
 
 	intel_state->cdclk = intel_state->dev_cdclk =
-		broxton_calc_cdclk(dev_priv, max_pixclk);
+		broxton_calc_cdclk(max_pixclk);
 
 	if (!intel_state->active_crtcs)
-		intel_state->dev_cdclk = broxton_calc_cdclk(dev_priv, 0);
+		intel_state->dev_cdclk = broxton_calc_cdclk(0);
 
 	return 0;
 }