VK: add two options (workarounds)

Force FIFO present mode option is workaround for recent MESA drivers
Force primitive restart flag should also work on said drivers

rpcs3/Emu/RSX/VK/VKHelpers.cpp

@@ -299,7 +299,7 @@ namespace vk
 		{
 			if (gpu_name.find(test) != std::string::npos)
 			{
-				g_drv_no_primitive_restart_flag = true;
+				g_drv_no_primitive_restart_flag = !g_cfg.video.vk.force_primitive_restart;
 				break;
 			}
 		}

rpcs3/Emu/RSX/VK/VKHelpers.h

@@ -907,7 +907,7 @@ namespace vk
 			//List of preferred modes in decreasing desirability
 			if (g_cfg.video.vsync)
 				preferred_modes = { VK_PRESENT_MODE_MAILBOX_KHR };
-			else
+			else if (!g_cfg.video.vk.force_fifo)
 				preferred_modes = { VK_PRESENT_MODE_IMMEDIATE_KHR, VK_PRESENT_MODE_FIFO_RELAXED_KHR, VK_PRESENT_MODE_MAILBOX_KHR };
 
 			bool mode_found = false;

rpcs3/Emu/System.h

@@ -361,6 +361,8 @@ struct cfg_root : cfg::node
 			node_vk(cfg::node* _this) : cfg::node(_this, "Vulkan") {}
 
 			cfg::string adapter{this, "Adapter"};
+			cfg::_bool force_fifo{this, "Force FIFO present mode"};
+			cfg::_bool force_primitive_restart{this, "Force primitive restart flag"};
 
 		} vk{this};