EXI_Device: Remove unnecessary const on EXIDevice_Create declaration parameters

These are only relevant on its definition.

Source/Core/Core/HW/EXI/EXI_Device.cpp

@@ -100,7 +100,7 @@ void IEXIDevice::TransferByte(u8& byte)
 }
 
 // F A C T O R Y
-std::unique_ptr<IEXIDevice> EXIDevice_Create(TEXIDevices device_type, const int channel_num)
+std::unique_ptr<IEXIDevice> EXIDevice_Create(const TEXIDevices device_type, const int channel_num)
 {
   std::unique_ptr<IEXIDevice> result;
 

Source/Core/Core/HW/EXI/EXI_Device.h

@@ -63,4 +63,4 @@ private:
   virtual void TransferByte(u8& byte);
 };
 
-std::unique_ptr<IEXIDevice> EXIDevice_Create(const TEXIDevices device_type, const int channel_num);
+std::unique_ptr<IEXIDevice> EXIDevice_Create(TEXIDevices device_type, int channel_num);