drm/radeon: constify all struct drm_*_helper funcs pointers

They are not to be modified.

Generated using the semantic patch:

@@
@@
(
const struct drm_crtc_helper_funcs *
|
- struct drm_crtc_helper_funcs *
+ const struct drm_crtc_helper_funcs *
)

@@
@@
(
const struct drm_encoder_helper_funcs *
|
- struct drm_encoder_helper_funcs *
+ const struct drm_encoder_helper_funcs *
)

@@
@@
(
const struct drm_connector_helper_funcs *
|
- struct drm_connector_helper_funcs *
+ const struct drm_connector_helper_funcs *
)

@@
@@
(
const struct drm_plane_helper_funcs *
|
- struct drm_plane_helper_funcs *
+ const struct drm_plane_helper_funcs *
)

Signed-off-by: Jani Nikula <[e-mail]>
Reviewed-by: Christian König <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>

drivers/gpu/drm/radeon/radeon_connectors.c

···
 		if (connector->display_info.bpc)
 			bpc = connector->display_info.bpc;
 		else if (ASIC_IS_DCE41(rdev) || ASIC_IS_DCE5(rdev)) {
-			struct drm_connector_helper_funcs *connector_funcs =
+			const struct drm_connector_helper_funcs *connector_funcs =
 				connector->helper_private;
 			struct drm_encoder *encoder = connector_funcs->best_encoder(connector);
 			struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
···
 	struct radeon_device *rdev = dev->dev_private;
 	struct drm_encoder *best_encoder = NULL;
 	struct drm_encoder *encoder = NULL;
-	struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
+	const struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
 	bool connected;
 	int i;
 
···
 		if (connector->encoder)
 			radeon_encoder = to_radeon_encoder(connector->encoder);
 		else {
-			struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
+			const struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
 			radeon_encoder = to_radeon_encoder(connector_funcs->best_encoder(connector));
 		}
 
···
 	if (connector->encoder)
 		radeon_encoder = to_radeon_encoder(connector->encoder);
 	else {
-		struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
+		const struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
 		radeon_encoder = to_radeon_encoder(connector_funcs->best_encoder(connector));
 	}
 
···
 	struct radeon_device *rdev = dev->dev_private;
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	struct drm_encoder *encoder;
-	struct drm_encoder_helper_funcs *encoder_funcs;
+	const struct drm_encoder_helper_funcs *encoder_funcs;
 	bool dret = false;
 	enum drm_connector_status ret = connector_status_disconnected;
 	int r;
···
 radeon_tv_detect(struct drm_connector *connector, bool force)
 {
 	struct drm_encoder *encoder;
-	struct drm_encoder_helper_funcs *encoder_funcs;
+	const struct drm_encoder_helper_funcs *encoder_funcs;
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	enum drm_connector_status ret = connector_status_disconnected;
 	int r;
···
 	struct radeon_device *rdev = dev->dev_private;
 	struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 	struct drm_encoder *encoder = NULL;
-	struct drm_encoder_helper_funcs *encoder_funcs;
+	const struct drm_encoder_helper_funcs *encoder_funcs;
 	int i, r;
 	enum drm_connector_status ret = connector_status_disconnected;
 	bool dret = false, broken_edid = false;
···
 			if (radeon_ddc_probe(radeon_connector, true)) /* try DDC */
 				ret = connector_status_connected;
 			else if (radeon_connector->dac_load_detect) { /* try load detection */
-				struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
+				const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 				ret = encoder_funcs->detect(encoder, connector);
 			}
 		}

drivers/gpu/drm/radeon/radeon_legacy_encoders.c

···
 static void radeon_legacy_encoder_disable(struct drm_encoder *encoder)
 {
 	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
-	struct drm_encoder_helper_funcs *encoder_funcs;
+	const struct drm_encoder_helper_funcs *encoder_funcs;
 
 	encoder_funcs = encoder->helper_private;
 	encoder_funcs->dpms(encoder, DRM_MODE_DPMS_OFF);