s390: 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 remaining arch/s390/ 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: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Cornelia Huck <cohuck@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/Makefile

+# SPDX-License-Identifier: GPL-2.0
 #
 # s390/Makefile
 #

arch/s390/boot/install.sh

 #!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
 #
 # arch/s390x/boot/install.sh
 #

arch/s390/hypfs/inode.c

+// SPDX-License-Identifier: GPL-1.0+
 /*
  *    Hypervisor filesystem for Linux on s390.
  *

arch/s390/include/asm/cpu_mf.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * CPU-measurement facilities
  *

arch/s390/include/asm/kprobes.h

+/* SPDX-License-Identifier: GPL-2.0+ */
 #ifndef _ASM_S390_KPROBES_H
 #define _ASM_S390_KPROBES_H
 /*

arch/s390/include/asm/kvm_host.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * definition for kernel virtual machines on s390
  *

arch/s390/include/asm/kvm_para.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * definition for paravirtual devices on s390
  *

arch/s390/include/asm/livepatch.h

+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * livepatch.h - s390-specific Kernel Live Patching Core
  *

arch/s390/include/asm/syscall.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Access to user system call parameters and results
  *

arch/s390/include/asm/sysinfo.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * definition for store system information stsi
  *