media: platform: stm32: Adopt SPDX identifier

Add SPDX identifiers to files under stm32 directory
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Acked-by: Philippe Ombredanne <pombredanne@nexb.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/stm32/stm32-cec.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * STM32 CEC driver
  * Copyright (C) STMicroelectronics SA 2017
  *
- * 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.
  */
 
 #include <linux/clk.h>

drivers/media/platform/stm32/stm32-dcmi.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Driver for STM32 Digital Camera Memory Interface
  *
@@ -5,7 +6,6 @@
  * Authors: Yannick Fertre <yannick.fertre@st.com>
  *          Hugues Fruchet <hugues.fruchet@st.com>
  *          for STMicroelectronics.
- * License terms:  GNU General Public License (GPL), version 2
  *
  * This driver is based on atmel_isi.c
  *