intel: add x11_display_scan() to scan displays

Unused yet.

v2: call intel_wsi_gpu_cleanup() unconditionally to clean up displays
diff --git a/icd/intel/gpu.c b/icd/intel/gpu.c
index 2c57ecf..645de1c 100644
--- a/icd/intel/gpu.c
+++ b/icd/intel/gpu.c
@@ -116,8 +116,7 @@
 
 void intel_gpu_destroy(struct intel_gpu *gpu)
 {
-    if (gpu->wsi_data)
-        intel_wsi_gpu_cleanup(gpu);
+    intel_wsi_gpu_cleanup(gpu);
 
     intel_gpu_cleanup_winsys(gpu);