imx: fix licensing in i.MX files

Some files for i.MX do not yet have the SPDX ID to reference the correct
license.

Signed-off-by: Stefano Babic <sbabic@denx.de>
Reviewed-by: Wolfgang Denk <wd@denx.de>

arch/arm/include/asm/arch-mx35/mmc_host_def.h

@@ -3,23 +3,7 @@
  * Texas Instruments, <www.ti.com>
  * Syed Mohammed Khasim <khasim@ti.com>
  *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * 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's version 2 of
- * the License.
- *
- * 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., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier:	GPL-2.0
  */
 
 #ifndef MMC_HOST_DEF_H

arch/arm/include/asm/arch-mx5/iomux-mx51.h

@@ -3,12 +3,7 @@
  * Copyright (C) 2010 Freescale Semiconductor, Inc.
  * Copyright (C) 2009-2012 Genesi USA, Inc.
  *
- * The code contained herein is licensed under the GNU General Public
- * License. You may obtain a copy of the GNU General Public License
- * Version 2 or later at the following locations:
- *
- * http://www.opensource.org/licenses/gpl-license.html
- * http://www.gnu.org/copyleft/gpl.html
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 /*

arch/arm/include/asm/arch-mxs/iomux-mx23.h

@@ -2,12 +2,7 @@
  * Copyright (C) 2009-2010 Amit Kucheria <amit.kucheria@canonical.com>
  * Copyright (C) 2010 Freescale Semiconductor, Inc.
  *
- * The code contained herein is licensed under the GNU General Public
- * License. You may obtain a copy of the GNU General Public License
- * Version 2 or later at the following locations:
- *
- * http://www.opensource.org/licenses/gpl-license.html
- * http://www.gnu.org/copyleft/gpl.html
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #ifndef __MACH_IOMUX_MX23_H__

arch/arm/include/asm/arch-mxs/iomux-mx28.h

@@ -2,12 +2,7 @@
  * Copyright (C) 2009-2010 Amit Kucheria <amit.kucheria@canonical.com>
  * Copyright (C) 2010 Freescale Semiconductor, Inc.
  *
- * The code contained herein is licensed under the GNU General Public
- * License. You may obtain a copy of the GNU General Public License
- * Version 2 or later at the following locations:
- *
- * http://www.opensource.org/licenses/gpl-license.html
- * http://www.gnu.org/copyleft/gpl.html
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #ifndef __MACH_IOMUX_MX28_H__