drm/i915: simplify intel_encoder_commit

{

	struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;

	struct drm_device *dev = encoder->dev;

	struct intel_encoder *intel_encoder = to_intel_encoder(encoder);

	struct intel_crtc *intel_crtc = to_intel_crtc(intel_encoder->base.crtc);

	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);

	/* lvds has its own version of commit see intel_lvds_commit */

	encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);