vk: Implement multithreaded command submission

- A few nagging issues remain, specifically that partial command stream
  largely caused by poor synchronization structures for partial CS flush
  and also the fact that occlusion map entries wait on a command buffer
  and not an EID!

rpcs3/Emu/RSX/RSXThread.cpp

@@ -446,10 +446,10 @@ namespace rsx
 
 		rsx::overlays::reset_performance_overlay();
 
+		g_dma_manager.init();
 		on_init_thread();
 
 		method_registers.init();
-		g_dma_manager.init();
 		m_profiler.enabled = !!g_cfg.video.overlay;
 
 		if (!zcull_ctrl)