Fix version-script for ze_intel_gpu

- export only ze* functions

Related-To: NEO-5509

Signed-off-by: Mateusz Hoppe <mateusz.hoppe@intel.com>

level_zero/core/source/dll/linux/ze.exports

@@ -1,11 +1,13 @@
 /*
- * Copyright (C) 2020 Intel Corporation
+ * Copyright (C) 2020-2021 Intel Corporation
  *
  * SPDX-License-Identifier: MIT
  *
  */
 
 {
+  global:
+      ze*;
   local:
-      cl*;
+      *;
 };