Service/Audio: add hwopus service, stub GetWorkBufferSize function

src/core/hle/service/audio/hwopus.h

@@ -0,0 +1,20 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/hle/service/service.h"
+
+namespace Service::Audio {
+
+class HwOpus final : public ServiceFramework<HwOpus> {
+public:
+    explicit HwOpus();
+    ~HwOpus() = default;
+
+private:
+    void GetWorkBufferSize(Kernel::HLERequestContext& ctx);
+};
+
+} // namespace Service::Audio