drm/i915: Remove unused mode_set hook from encoder

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470755054-32699-4-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_drv.h

@@ -209,7 +209,6 @@ struct intel_encoder {
 	void (*pre_pll_enable)(struct intel_encoder *);
 	void (*pre_enable)(struct intel_encoder *);
 	void (*enable)(struct intel_encoder *);
-	void (*mode_set)(struct intel_encoder *intel_encoder);
 	void (*disable)(struct intel_encoder *);
 	void (*post_disable)(struct intel_encoder *);
 	void (*post_pll_disable)(struct intel_encoder *);