drm/i915: rip out legacy encoder->mode_set callback

The encoder->mode_set callback from the crtc helpers is now completely
unused in our driver. Good riddance!

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e912084..56bc2ef 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6220,11 +6220,8 @@
 {
 	struct drm_device *dev = crtc->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct drm_encoder_helper_funcs *encoder_funcs;
 	struct intel_encoder *encoder;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	struct drm_display_mode *adjusted_mode =
-		&intel_crtc->config.adjusted_mode;
 	struct drm_display_mode *mode = &intel_crtc->config.requested_mode;
 	int pipe = intel_crtc->pipe;
 	int ret;
@@ -6243,12 +6240,7 @@
 			encoder->base.base.id,
 			drm_get_encoder_name(&encoder->base),
 			mode->base.id, mode->name);
-		if (encoder->mode_set) {
-			encoder->mode_set(encoder);
-		} else {
-			encoder_funcs = encoder->base.helper_private;
-			encoder_funcs->mode_set(&encoder->base, mode, adjusted_mode);
-		}
+		encoder->mode_set(encoder);
 	}
 
 	return 0;