s390: pci: add SPDX identifiers to the remaining files

It's good to have SPDX identifiers in all files to make it easier to
audit the kernel tree for correct licenses.

Update the arch/s390/pci/ files with the correct SPDX license
identifier based on the license text in the file itself.  The SPDX
identifier is a legally binding shorthand, which can be used instead of
the full boiler plate text.

This work is based on a script and data from Thomas Gleixner, Philippe
Ombredanne, and Kate Stewart.

Cc: Sebastian Ott <sebott@linux.vnet.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/pci/pci.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright IBM Corp. 2012
  *

arch/s390/pci/pci_debug.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  *  Copyright IBM Corp. 2012,2015
  *

arch/s390/pci/pci_dma.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright IBM Corp. 2012
  *

arch/s390/pci/pci_insn.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * s390 specific pci instructions
  *