drm/exynos: Constify exynos_drm_crtc_ops

The Exynos DRM code does not modify the ops provided by CRTC driver in
exynos_drm_crtc_create() call.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.h b/drivers/gpu/drm/exynos/exynos_drm_crtc.h
index 0ecd8fc..0f3aa70 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.h
@@ -18,11 +18,11 @@
 #include "exynos_drm_drv.h"
 
 struct exynos_drm_crtc *exynos_drm_crtc_create(struct drm_device *drm_dev,
-					       struct drm_plane *plane,
-					       int pipe,
-					       enum exynos_drm_output_type type,
-					       struct exynos_drm_crtc_ops *ops,
-					       void *context);
+					struct drm_plane *plane,
+					int pipe,
+					enum exynos_drm_output_type type,
+					const struct exynos_drm_crtc_ops *ops,
+					void *context);
 int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int pipe);
 void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int pipe);
 void exynos_drm_crtc_finish_pageflip(struct drm_device *dev, int pipe);