update khronos headers from mainstream.

src/video/khronos/vulkan/vk_icd.h

@@ -2,8 +2,7 @@
  * Copyright 2015-2023 The Khronos Group Inc.
  * Copyright 2015-2023 Valve Corporation
  * Copyright 2015-2023 LunarG, Inc.
- *
- * SPDX-License-Identifier: Apache-2.0
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
  */
 #pragma once
 

src/video/khronos/vulkan/vk_layer.h

@@ -2,8 +2,7 @@
  * Copyright 2015-2023 The Khronos Group Inc.
  * Copyright 2015-2023 Valve Corporation
  * Copyright 2015-2023 LunarG, Inc.
- *
- * SPDX-License-Identifier: Apache-2.0
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
  */
 #pragma once