mfd: madera: Fixup SPDX headers

GPL-2.0-only is the preferred way of expressing v2 of the GPL, so switch
to that. Remove some redundant copyright notices and correct some
instances where the wrong comment type has been used in header files.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/cs47l15-tables.c

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Regmap tables for CS47L15 codec
  *

drivers/mfd/cs47l35-tables.c

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Regmap tables for CS47L35 codec
  *
  * Copyright (C) 2015-2017 Cirrus Logic
- *
- * 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; version 2.
  */
 
 #include <linux/device.h>

drivers/mfd/cs47l85-tables.c

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Regmap tables for CS47L85 codec
  *
  * Copyright (C) 2015-2017 Cirrus Logic
- *
- * 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; version 2.
  */
 
 #include <linux/device.h>

drivers/mfd/cs47l90-tables.c

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Regmap tables for CS47L90 codec
  *
  * Copyright (C) 2015-2017 Cirrus Logic
- *
- * 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; version 2.
  */
 
 #include <linux/device.h>

drivers/mfd/cs47l92-tables.c

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Regmap tables for CS47L92 codec
  *

drivers/mfd/madera-core.c

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Core MFD support for Cirrus Logic Madera codecs
  *
  * Copyright (C) 2015-2018 Cirrus Logic
- *
- * 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; version 2.
  */
 
 #include <linux/device.h>

drivers/mfd/madera-i2c.c

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * I2C bus interface to Cirrus Logic Madera codecs
  *
  * Copyright (C) 2015-2018 Cirrus Logic
- *
- * 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; version 2.
  */
 
 #include <linux/device.h>

drivers/mfd/madera-spi.c

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * SPI bus interface to Cirrus Logic Madera codecs
  *
  * Copyright (C) 2015-2018 Cirrus Logic
- *
- * 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; version 2.
  */
 
 #include <linux/device.h>

include/linux/mfd/madera/core.h

-// SPDX-License-Identifier: GPL-2.0
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * MFD internals for Cirrus Logic Madera codecs
  *
  * Copyright (C) 2015-2018 Cirrus Logic
- *
- * 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; version 2.
  */
 
 #ifndef MADERA_CORE_H

include/linux/mfd/madera/pdata.h

-// SPDX-License-Identifier: GPL-2.0
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Platform data for Cirrus Logic Madera codecs
  *
  * Copyright (C) 2015-2018 Cirrus Logic
- *
- * 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; version 2.
  */
 
 #ifndef MADERA_PDATA_H

include/linux/mfd/madera/registers.h

-// SPDX-License-Identifier: GPL-2.0
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Madera register definitions
  *
  * Copyright (C) 2015-2018 Cirrus Logic
- *
- * 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; version 2.
  */
 
 #ifndef MADERA_REGISTERS_H