vk: Ensure async scheduler thread is never auto-spawned by fxo

- This thread is a resource hog for design reasons.

rpcs3/Emu/RSX/VK/VKAsyncScheduler.cpp

@@ -12,6 +12,14 @@ namespace vk
 {
 	void AsyncTaskScheduler::operator()()
 	{
+		if (g_cfg.video.renderer != video_renderer::vulkan || !g_cfg.video.vk.asynchronous_texture_streaming)
+		{
+			// Invalid renderer combination, do not proceed. This should never happen.
+			// NOTE: If managed by fxo, this object may be created automatically on boot.
+			rsx_log.notice("Vulkan async streaming is disabled. This thread will now exit.");
+			return;
+		}
+
 		init_config_options();
 		if (!m_use_host_scheduler)
 		{

rpcs3/Emu/RSX/VK/VKAsyncScheduler.h

@@ -73,7 +73,7 @@ namespace vk
 		void insert_sync_event();
 
 	public:
-		AsyncTaskScheduler() = default;
+		AsyncTaskScheduler(const std::string_view& name) : thread_name(name) {} // This ctor stops default initialization by fxo
 		~AsyncTaskScheduler();
 
 		command_buffer* get_current();
@@ -86,7 +86,7 @@ namespace vk
 		// Thread entry-point
 		void operator()();
 
-		static constexpr auto thread_name = "Vulkan Async Scheduler"sv;
+		const std::string_view thread_name;
 	};
 
 	using async_scheduler_thread = named_thread<AsyncTaskScheduler>;

rpcs3/Emu/RSX/VK/VKGSRender.cpp

@@ -592,7 +592,7 @@ VKGSRender::VKGSRender() : GSRender()
 		if (backend_config.supports_asynchronous_compute)
 		{
 			// Run only if async compute can be used.
-			g_fxo->init<vk::async_scheduler_thread>();
+			g_fxo->init<vk::async_scheduler_thread>("Vulkan Async Scheduler"sv);
 		}
 	}
 }