Rename the MBED implementation.

As we're going to add another Zephyr implementation.

Author: iabdalkader

src/Arduino_GigaDisplayTouch.cpp renamed to src/Arduino_GigaDisplayTouchMbed.cpp

@@ -21,6 +21,7 @@
  * @author Leonardo Cavagnis
  * @brief Source file for the Arduino Giga Display Touch library.
  */
+#ifdef __MBED__
 
  /* Includes -----------------------------------------------------------------*/
 #include "Arduino_GigaDisplayTouch.h"
@@ -262,4 +263,4 @@ uint8_t Arduino_GigaDisplayTouch::_gt911ReadInputCoord(uint8_t * pointsbuf, uint
     return 0;
 }
 
-/**** END OF FILE ****/
+#endif /* #ifdef __MBED__ */