cores/xmc: Write() with buf and size.

Signed-off-by: MDin <Dinesh.M-EE@infineon.com>

Author: dineshgit411

cores/xmc/Uart.h

@@ -95,9 +95,10 @@ 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;
 extern Uart Serial1;