drm/i915: Keep drm_crtc->state in sync with intel_crtc->config

So that atomic operations will reference the right crtc state.
Signed-off-by: NAnder Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: NMatt Roper <matthew.d.roper@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -8931,6 +8931,7 @@ static void intel_crtc_set_state(struct intel_crtc *crtc,
 {
 	kfree(crtc->config);
 	crtc->config = crtc_state;
+	crtc->base.state = &crtc_state->base;
 }
 
 static void intel_crtc_destroy(struct drm_crtc *crtc)