PCI: Add SPDX GPL-2.0 to replace COPYING boilerplate

Add SPDX GPL-2.0 to all PCI files that referred to the kernel default
"COPYING" file, which specifies GPL version 2.

Remove the boilerplate language referring to the GPL and "COPYING", relying
on the assertion in b2441318 ("License cleanup: add SPDX GPL-2.0
license identifier to files with no license") that the SPDX identifier may
be used instead of the full boilerplate text.
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/pci/host/pci-thunder-ecam.c

+// SPDX-License-Identifier: GPL-2.0
 /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
  * Copyright (C) 2015, 2016 Cavium, Inc.
  */
 

drivers/pci/hotplug/sgi_hotplug.c

+// SPDX-License-Identifier: GPL-2.0
 /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
  * Copyright (C) 2005-2006 Silicon Graphics, Inc. All rights reserved.
  *
  * This work was based on the 2.4/2.6 kernel development by Dick Reigner.

drivers/pci/pcie/aer/aerdrv.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * drivers/pci/pcie/aer/aerdrv.c
  *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
  * This file implements the AER root port service driver. The driver will
  * register an irq handler. When root port triggers an AER interrupt, the irq
  * handler will collect root port status and schedule a work.

drivers/pci/pcie/aer/aerdrv_core.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * drivers/pci/pcie/aer/aerdrv_core.c
  *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
  * This file implements the core part of PCIe AER. When a PCIe
  * error is delivered, an error message will be collected and printed to
  * console, then, an error recovery procedure will be executed by following

drivers/pci/pcie/aer/aerdrv_errprint.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * drivers/pci/pcie/aer/aerdrv_errprint.c
  *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
  * Format error messages and print them to console.
  *
  * Copyright (C) 2006 Intel Corp.

drivers/pci/pcie/pcie-dpc.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * PCI Express Downstream Port Containment services driver
  * Author: Keith Busch <keith.busch@intel.com>
  *
  * Copyright (C) 2016 Intel Corp.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
  */
 
 #include <linux/delay.h>