IOS/SDIOSlot0: Remove unimplemented prototype

This function doesn't have an implementation, so we can remove it to
make for less reading (and a linker error waiting to happen).

Source/Core/Core/IOS/SDIO/SDIOSlot0.h

@@ -138,7 +138,6 @@ private:
   s32 ExecuteCommand(const Request& request, u32 BufferIn, u32 BufferInSize, u32 BufferIn2,
                      u32 BufferInSize2, u32 _BufferOut, u32 BufferOutSize);
   void OpenInternal();
-  void InitStatus();
 
   u32 GetOCRegister() const;