hwc2: Start IDisplayConfig after composer init done.

Change-Id: Iabcc9b85cbacbc585f5eab8534e4589924e14111
CRs-Fixed: 2530738
diff --git a/composer/hwc_session.cpp b/composer/hwc_session.cpp
index 5e8659b..bea3d00 100644
--- a/composer/hwc_session.cpp
+++ b/composer/hwc_session.cpp
@@ -170,7 +170,6 @@
     return -EINVAL;
   }
 
-  StartServices();
   HWCDebugHandler::Get()->GetProperty(ENABLE_NULL_DISPLAY_PROP, &null_display_mode_);
   HWCDebugHandler::Get()->GetProperty(DISABLE_HOTPLUG_BWCHECK, &disable_hotplug_bwcheck_);
   HWCDebugHandler::Get()->GetProperty(DISABLE_MASK_LAYER_HINT, &disable_mask_layer_hint_);
@@ -194,6 +193,7 @@
   }
 
   is_composer_up_ = true;
+  StartServices();
 
   return 0;
 }