drm/i915: don't save all the encoder/crtc state in set_config

We actually only touch the connector -> encoder and encoder -> crtc
linking. So it's enough to just save/restore that.

While at it, also switch to kcalloc to allocate these arrays (omission
in the commit message spotted by Jesse Barnes).

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index fad11c8..4946282 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -424,8 +424,8 @@
 extern enum drm_connector_status intel_panel_detect(struct drm_device *dev);
 
 struct intel_set_config {
-	struct drm_connector *save_connectors;
-	struct drm_encoder *save_encoders;
+	struct drm_encoder **save_connector_encoders;
+	struct drm_crtc **save_encoder_crtcs;
 	struct drm_crtc *save_crtcs;
 
 	bool fb_changed;