DSPEmulator: Move common variable into base class

Source/Core/Core/DSPEmulator.h

@@ -15,7 +15,7 @@ public:
   virtual ~DSPEmulator() {}
   virtual bool IsLLE() = 0;
 
-  virtual bool Initialize(bool bWii, bool bDSPThread) = 0;
+  virtual bool Initialize(bool wii, bool dsp_thread) = 0;
   virtual void Shutdown() = 0;
 
   virtual void DoState(PointerWrap& p) = 0;
@@ -30,6 +30,9 @@ public:
   virtual void DSP_Update(int cycles) = 0;
   virtual void DSP_StopSoundStream() = 0;
   virtual u32 DSP_UpdateRate() = 0;
+
+protected:
+  bool m_wii = false;
 };
 
 std::unique_ptr<DSPEmulator> CreateDSPEmulator(bool hle);