drm/i915: Move the lvds OpRegion lid detection code to panel and reuse for eDP

Share the lid detection code for the all panels for consistent behaviour
and a single place to add the eventual quirks for crap hardware.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index e478f6a..65959a2 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1522,9 +1522,13 @@
 {
 	enum drm_connector_status status;
 
-	/* Can't disconnect eDP */
-	if (is_edp(intel_dp))
-		return connector_status_connected;
+	/* Can't disconnect eDP, but you can close the lid... */
+	if (is_edp(intel_dp)) {
+		status = intel_panel_detect(intel_dp->base.base.dev);
+		if (status == connector_status_unknown)
+			status = connector_status_connected;
+		return status;
+	}
 
 	status = connector_status_disconnected;
 	if (intel_dp_aux_native_read(intel_dp,