drm/i915: Keep overlay functions naming consistent

All other overlay functions(almost all other functions in i915)
follow intel_overlay_verb, so renaming overlay ones that do not match
that.

Cc: Jani Nikula <[e-mail]>
Cc: Ville Syrjälä <[e-mail]>
Signed-off-by: José Roberto de Souza <[e-mail]>
Reviewed-by: Ville Syrjälä <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/i915_drv.c

···
 	if (ret)
 		goto cleanup_modeset;
 
-	intel_setup_overlay(dev_priv);
+	intel_overlay_setup(dev_priv);
 
 	if (INTEL_INFO(dev_priv)->num_pipes == 0)
 		return 0;

drivers/gpu/drm/i915/intel_display.c

···
 
 	drm_mode_config_cleanup(dev);
 
-	intel_cleanup_overlay(dev_priv);
+	intel_overlay_cleanup(dev_priv);
 
 	intel_teardown_gmbus(dev_priv);
 

drivers/gpu/drm/i915/intel_drv.h

···
 bool intel_is_dual_link_lvds(struct drm_device *dev);
 
 /* intel_overlay.c */
-void intel_setup_overlay(struct drm_i915_private *dev_priv);
-void intel_cleanup_overlay(struct drm_i915_private *dev_priv);
+void intel_overlay_setup(struct drm_i915_private *dev_priv);
+void intel_overlay_cleanup(struct drm_i915_private *dev_priv);
 int intel_overlay_switch_off(struct intel_overlay *overlay);
 int intel_overlay_put_image_ioctl(struct drm_device *dev, void *data,
 				  struct drm_file *file_priv);

drivers/gpu/drm/i915/intel_overlay.c

···
 	return err;
 }
 
-void intel_setup_overlay(struct drm_i915_private *dev_priv)
+void intel_overlay_setup(struct drm_i915_private *dev_priv)
 {
 	struct intel_overlay *overlay;
 	int ret;
···
 	kfree(overlay);
 }
 
-void intel_cleanup_overlay(struct drm_i915_private *dev_priv)
+void intel_overlay_cleanup(struct drm_i915_private *dev_priv)
 {
 	struct intel_overlay *overlay;