license: Update deprecated SPDX tag GPL-2.0+ to GPL-2.0-or-later

The 'GPL-2.0+' license identifier has been deprecated since license
list version 2.0rc2 [1] and replaced by the 'GPL-2.0-or-later' [2]
tag.

[1] https://spdx.org/licenses/GPL-2.0+.html
[2] https://spdx.org/licenses/GPL-2.0-or-later.html

Mechanical patch running:

  $ sed -i -e s/GPL-2.0+/GPL-2.0-or-later/ \
    $(git grep -lP 'SPDX-License-Identifier: \W+GPL-2.0\+[ $]' \
        | egrep -v '^linux-headers|^include/standard-headers')

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/core/uboot_image.h

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * (C) Copyright 2008 Semihalf
  *

hw/nvram/fw_cfg-acpi.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Add fw_cfg device in DSDT
  *

hw/virtio/virtio-acpi.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * virtio ACPI Support
  *

include/hw/nvram/fw_cfg_acpi.h

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * ACPI support for fw_cfg
  *

include/hw/usb/dwc2-regs.h

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
+/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-3-Clause) */
 /*
  * Imported from the Linux kernel file drivers/usb/dwc2/hw.h, commit
  * a89bae709b3492b478480a2c9734e7e9393b279c ("usb: dwc2: Move

include/hw/virtio/virtio-acpi.h

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * ACPI support for virtio
  */

target/riscv/cpu-param.h

@@ -2,7 +2,7 @@
  * RISC-V cpu parameters for qemu.
  *
  * Copyright (c) 2017-2018 SiFive, Inc.
- * SPDX-License-Identifier: GPL-2.0+
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #ifndef RISCV_CPU_PARAM_H

target/s390x/cpu-param.h

@@ -2,7 +2,7 @@
  * S/390 cpu parameters for qemu.
  *
  * Copyright (c) 2009 Ulrich Hecht
- * SPDX-License-Identifier: GPL-2.0+
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #ifndef S390_CPU_PARAM_H