drm/exynos: remove unused prototype for crtc

exynos_drm_crtc_wait_pending_update, exynos_drm_crtc_finish_update
are not used anymore.

Signed-off-by: Kwanghoon Son <k.son@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

Author: KwangSon

drivers/gpu/drm/exynos/exynos_drm_crtc.h

@@ -19,9 +19,6 @@ struct exynos_drm_crtc *exynos_drm_crtc_create(struct drm_device *drm_dev,
 					enum exynos_drm_output_type out_type,
 					const struct exynos_drm_crtc_ops *ops,
 					void *context);
-void exynos_drm_crtc_wait_pending_update(struct exynos_drm_crtc *exynos_crtc);
-void exynos_drm_crtc_finish_update(struct exynos_drm_crtc *exynos_crtc,
-				   struct exynos_drm_plane *exynos_plane);
 
 /* This function gets crtc device matched with out_type. */
 struct exynos_drm_crtc *exynos_drm_crtc_get_by_type(struct drm_device *drm_dev,