vulkan: Update XML and headers to 1.2.168

This brings in the following extensions:

- VK_KHR_workgroup_memory_explicit_layout
- VK_KHR_zero_initialize_workgroup_memory

Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8699>

include/vulkan/vk_icd.h

@@ -121,6 +121,7 @@ typedef enum {
     VK_ICD_WSI_PLATFORM_METAL,
     VK_ICD_WSI_PLATFORM_DIRECTFB,
     VK_ICD_WSI_PLATFORM_VI,
+    VK_ICD_WSI_PLATFORM_GGP,
 } VkIcdWsiPlatform;
 
 typedef struct {
@@ -196,6 +197,13 @@ typedef struct {
 } VkIcdSurfaceIOS;
 #endif  // VK_USE_PLATFORM_IOS_MVK
 
+#ifdef VK_USE_PLATFORM_GGP
+typedef struct {
+    VkIcdSurfaceBase base;
+    GgpStreamDescriptor streamDescriptor;
+} VkIcdSurfaceGgp;
+#endif  // VK_USE_PLATFORM_GGP
+
 typedef struct {
     VkIcdSurfaceBase base;
     VkDisplayModeKHR displayMode;