cores/xmc: Write function with buf and size.

Signed-off-by: MDin <[email protected]>

Author: dineshgit411

cores/xmc/Uart.h

@@ -95,9 +95,9 @@ class Uart : public HardwareSerial {
     void IrqHandler(void);
 
 private:
-    bool serial_ready = false;
     static constexpr size_t BUF_LENGTH = 512;
     RingBufferN<BUF_LENGTH> _rx_buffer;
+    bool serial_ready = false;
 };
 
 extern Uart Serial;