cores/xmc: Removed Copyrights comments.

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

Author: dineshgit411

cores/xmc/wiring_digital.c

@@ -1,27 +1,3 @@
-/*
-  Copyright (c) 2011 Arduino.  All right reserved.
-
-  This library is free software; you can redistribute it and/or
-  modify it under the terms of the GNU Lesser General Public
-  License as published by the Free Software Foundation; either
-  version 2.1 of the License, or (at your option) any later version.
-
-  This library is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-  See the GNU Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public
-  License along with this library; if not, write to the Free Software
-  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-
-  Copyright (c) 2018 Infineon Technologies AG
-  This file has been modified for the XMC microcontroller series.
- */
-
-//****************************************************************************
-// @Project Includes
-//****************************************************************************
 #include "Arduino.h"
 #ifdef __cplusplus
 extern "C" {