Update drv_gpio.h

bsp/x1000/drivers/drv_gpio.h

 /*
- * File      : board_gpio.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
+ * Copyright (c) 2006-2018, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program 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 General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
@@ -115,7 +101,7 @@ enum gpio_function
     GPIO_INT_HI     = 0x09,  //1001, High Level trigger interrupt
     GPIO_INT_FE     = 0x0a,  //1010, Fall Edge trigger interrupt
     GPIO_INT_RE     = 0x0b,  //1011, Rise Edge trigger interrupt
-    GPIO_PULL 		= 0x10,  //0001 0000, GPIO enable pull
+    GPIO_PULL       = 0x10,  //0001 0000, GPIO enable pull
     GPIO_INPUT_PULL = 0x16,  //0001 0110, GPIO as input and enable pull
 };