PCI: Add SPDX GPL-2.0 when no license was specified

b24413180f ("License cleanup: add SPDX GPL-2.0 license identifier to
files with no license") added SPDX GPL-2.0 to several PCI files that
previously contained no license information.

Add SPDX GPL-2.0 to all other PCI files that did not contain any license
information and hence were under the default GPL version 2 license of the
kernel.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/pci/hotplug/Kconfig

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # PCI Hotplug support
 #