DSPHLE: Set m_dsp_control to a consistent value in Initialize().

Source/Core/Core/HW/DSPHLE/DSPHLE.cpp

@@ -23,6 +23,8 @@ bool DSPHLE::Initialize(bool wii, bool dsp_thread)
   m_last_ucode = nullptr;
 
   SetUCode(UCODE_ROM);
+
+  m_dsp_control.Hex = 0;
   m_dsp_control.DSPHalt = 1;
   m_dsp_control.DSPInit = 1;