Quick fix to address https://github.com/godotengine/godot/issues/115924

The fix resets the Android global vulkan context when running in XR mode to allow the XR module to drive the initialization via vulkan hooks.

platform/android/display_server_android.cpp

@@ -715,6 +715,7 @@ void DisplayServerAndroid::free_vulkan_global_context() {
 	if (rendering_context_global != nullptr) {
 		memdelete(rendering_context_global);
 		rendering_context_global = nullptr;
+		rendering_context_global_checked = false;
 	}
 }
 #endif
@@ -781,6 +782,7 @@ DisplayServerAndroid::DisplayServerAndroid(const String &p_rendering_driver, Dis
 
 #ifdef VULKAN_ENABLED
 	if (rendering_driver == "vulkan") {
+		check_vulkan_global_context(true);
 		if (rendering_context_global == nullptr) {
 			ERR_PRINT("Can't initialize display server with Vulkan driver because no Vulkan context is available.");
 			r_error = ERR_UNAVAILABLE;