drm/tegra: Remove remnants of the output midlayer

The tegra_output midlayer is now completely gone and output drivers use
it purely as a helper library.

Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index a999478..1401d0d 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -990,10 +990,6 @@
 					 &tegra_dsi_connector_helper_funcs);
 		dsi->output.connector.dpms = DRM_MODE_DPMS_OFF;
 
-		if (dsi->output.panel)
-			drm_panel_attach(dsi->output.panel,
-					 &dsi->output.connector);
-
 		drm_encoder_init(drm, &dsi->output.encoder,
 				 &tegra_dsi_encoder_funcs,
 				 DRM_MODE_ENCODER_DSI);
@@ -1004,6 +1000,14 @@
 						  &dsi->output.encoder);
 		drm_connector_register(&dsi->output.connector);
 
+		err = tegra_output_init(drm, &dsi->output);
+		if (err < 0) {
+			dev_err(client->dev,
+				"failed to initialize output: %d\n",
+				err);
+			goto reset;
+		}
+
 		dsi->output.encoder.possible_crtcs = 0x3;
 	}