include: Add SPDX-License-Identifiers to files missing them

This adds SPDX-License-Identifiers to all of the files in src/include
that are missing them or have unrecognized identifiers.

Files that were written specifically for coreboot and don't have license
information are licensed GPL-2.0-only, which is the license for the
overall coreboot project.

Files that were sourced from Linux are similarly GPL-2.0-only.

The cpu/power files were committed with source that was licensed as
GPL-2.0-or-later, so presumably that's the license for that entire
commit.

The final file, vbe.h gives a pointer to the BSD-2-Clause license
at opensource.org.

Change-Id: I3f8fd7848ce11c1a0060e05903fb17a7583b4725
Signed-off-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66284
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Felix Singer <felixsinger@posteo.net>

src/include/device/cardbus.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 /* (c) 2005 Linux Networx GPL see COPYING for details */
 
 #ifndef DEVICE_CARDBUS_H

src/include/device/device.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef DEVICE_H
 
 #define DEVICE_H

src/include/device/path.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef DEVICE_PATH_H
 #define DEVICE_PATH_H
 

src/include/device/pci.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 /*
  *	PCI defines and function prototypes
  *	Copyright 1994, Drew Eckhardt

src/include/device/pci_def.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef PCI_DEF_H
 #define PCI_DEF_H
 

src/include/device/pci_rom.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef PCI_ROM_H
 #define PCI_ROM_H
 

src/include/device/pciexp.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef DEVICE_PCIEXP_H
 #define DEVICE_PCIEXP_H
 /* (c) 2005 Linux Networx GPL see COPYING for details */

src/include/device/pcix.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef DEVICE_PCIX_H
 #define DEVICE_PCIX_H
 /* (c) 2005 Linux Networx GPL see COPYING for details */

src/include/device/pnp_def.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef DEVICE_PNP_DEF_H
 #define DEVICE_PNP_DEF_H
 

src/include/device/resource.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef DEVICE_RESOURCE_H
 #define DEVICE_RESOURCE_H
 

src/include/device/smbus.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef DEVICE_SMBUS_H
 #define DEVICE_SMBUS_H
 

src/include/device/smbus_def.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef DEVICE_SMBUS_DEF_H
 #define DEVICE_SMBUS_DEF_H