drm: mediatek: Rely on the default ->best_encoder() behavior

We have a 1:1 relationship between connectors and encoders and the
driver is relying on the atomic helpers: we can drop the custom
->best_encoder() implementation and let the core call
drm_atomic_helper_best_encoder() for us.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1465300095-16971-8-git-send-email-boris.brezillon@free-electrons.com

drivers/gpu/drm/mediatek/mtk_dsi.c

@@ -575,14 +575,6 @@ static int mtk_dsi_connector_get_modes(struct drm_connector *connector)
 	return drm_panel_get_modes(dsi->panel);
 }
 
-static struct drm_encoder *mtk_dsi_connector_best_encoder(
-		struct drm_connector *connector)
-{
-	struct mtk_dsi *dsi = connector_to_dsi(connector);
-
-	return &dsi->encoder;
-}
-
 static const struct drm_encoder_helper_funcs mtk_dsi_encoder_helper_funcs = {
 	.mode_fixup = mtk_dsi_encoder_mode_fixup,
 	.mode_set = mtk_dsi_encoder_mode_set,
@@ -603,7 +595,6 @@ static const struct drm_connector_funcs mtk_dsi_connector_funcs = {
 static const struct drm_connector_helper_funcs
 	mtk_dsi_connector_helper_funcs = {
 	.get_modes = mtk_dsi_connector_get_modes,
-	.best_encoder = mtk_dsi_connector_best_encoder,
 };
 
 static int mtk_drm_attach_bridge(struct drm_bridge *bridge,