drm/i915: Pass dev_priv to .get_display_clock_speed()

Unify our approach to things by passing around dev_priv instead of dev.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1477946245-14134-15-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index eeed752..60c937d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -494,7 +494,7 @@ struct intel_limit;
 struct dpll;
 
 struct drm_i915_display_funcs {
-	int (*get_display_clock_speed)(struct drm_device *dev);
+	int (*get_display_clock_speed)(struct drm_i915_private *dev_priv);
 	int (*get_fifo_size)(struct drm_device *dev, int plane);
 	int (*compute_pipe_wm)(struct intel_crtc_state *cstate);
 	int (*compute_intermediate_wm)(struct drm_device *dev,