Update IO_PCA9555.h

Now compiles and works on PCA9548 Mux. Tested with MCP23017 and PCA9555 on the same Subbus

IO_PCA9555.h

@@ -34,16 +34,15 @@ public:
     if (checkNoOverlap(vpin, nPins, i2cAddress)) new PCA9555(vpin,nPins, i2cAddress, interruptPin);
   }
 
+private:  
   // Constructor
-  PCA9555(VPIN vpin, int nPins, uint8_t I2CAddress, int interruptPin=-1) 
+  PCA9555(VPIN vpin, uint8_t nPins, I2CAddress I2CAddress, int interruptPin=-1) 
     : GPIOBase<uint16_t>((FSH *)F("PCA9555"), vpin, nPins, I2CAddress, interruptPin) 
   {
     requestBlock.setRequestParams(_I2CAddress, inputBuffer, sizeof(inputBuffer),
       outputBuffer, sizeof(outputBuffer));
     outputBuffer[0] = REG_INPUT_P0;
   }
-
-private:
   void _writeGpioPort() override {
     I2CManager.write(_I2CAddress, 3, REG_OUTPUT_P0, _portOutputState, _portOutputState>>8);
   }