drm: plane: Make 'formats' parameter to drm_plane_init() const

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index dd55727..42c89b2 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -828,7 +828,7 @@
 			  struct drm_plane *plane,
 			  unsigned long possible_crtcs,
 			  const struct drm_plane_funcs *funcs,
-			  uint32_t *formats, uint32_t format_count);
+			  const uint32_t *formats, uint32_t format_count);
 extern void drm_plane_cleanup(struct drm_plane *plane);
 
 extern void drm_encoder_cleanup(struct drm_encoder *encoder);