GPUTHread: Remove async reads from Normal Accuracy.

src/video_core/gpu_thread.cpp

@@ -99,25 +99,13 @@ void ThreadManager::FlushRegion(VAddr addr, u64 size) {
         PushCommand(FlushRegionCommand(addr, size));
         return;
     }
-
-    // Asynchronous GPU mode
-    switch (Settings::values.gpu_accuracy.GetValue()) {
-    case Settings::GPUAccuracy::Normal:
-        PushCommand(FlushRegionCommand(addr, size));
-        break;
-    case Settings::GPUAccuracy::High:
-        // TODO(bunnei): Is this right? Preserving existing behavior for now
-        break;
-    case Settings::GPUAccuracy::Extreme: {
+    if (!Settings::IsGPULevelExtreme()) {
+        return;
+    }
     auto& gpu = system.GPU();
     u64 fence = gpu.RequestFlush(addr, size);
     PushCommand(GPUTickCommand(), true);
     ASSERT(fence <= gpu.CurrentFlushRequestFence());
-        break;
-    }
-    default:
-        UNIMPLEMENTED_MSG("Unsupported gpu_accuracy {}", Settings::values.gpu_accuracy.GetValue());
-    }
 }
 
 void ThreadManager::InvalidateRegion(VAddr addr, u64 size) {