[XS] Change in coreboot[main]: src: Add missing SPDX license headers

[Felix Singer (Code Review)]

Felix Singer has submitted this change. ( https://review.coreboot.org/c/coreboot/+/81421?usp=email )

Change subject: src: Add missing SPDX license headers
......................................................................

src: Add missing SPDX license headers

Other files in the commits that added these files were licensed under
GPL-2.0-only, and the project as a whole is GPL-2.0-only, so use that
as the license.

Change-Id: I6c1a7ba582f61f98069ebf3857a8b5bdc8588c3e
Signed-off-by: Nicholas Chin 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81421
Reviewed-by: Felix Singer 
Tested-by: build bot (Jenkins) 
---
M src/mainboard/google/myst/variants/baseboard/include/baseboard/port_descriptors.h
M src/mainboard/google/skyrim/variants/baseboard/include/baseboard/port_descriptors.h
M src/soc/sifive/fu740/include/soc/gpio.h
3 files changed, 6 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Felix Singer: Looks good to me, approved

diff --git a/src/mainboard/google/myst/variants/baseboard/include/baseboard/port_descriptors.h b/src/mainboard/google/myst/variants/baseboard/include/baseboard/port_descriptors.h
index 7742bed..bc92b69 100644
--- a/src/mainboard/google/myst/variants/baseboard/include/baseboard/port_descriptors.h
+++ b/src/mainboard/google/myst/variants/baseboard/include/baseboard/port_descriptors.h
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef __BASEBOARD_PORT_DESCRIPTORS_H__
 #define __BASEBOARD_PORT_DESCRIPTORS_H__

diff --git a/src/mainboard/google/skyrim/variants/baseboard/include/baseboard/port_descriptors.h b/src/mainboard/google/skyrim/variants/baseboard/include/baseboard/port_descriptors.h
index 40da0b4..1315379 100644
--- a/src/mainboard/google/skyrim/variants/baseboard/include/baseboard/port_descriptors.h
+++ b/src/mainboard/google/skyrim/variants/baseboard/include/baseboard/port_descriptors.h
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef __BASEBOARD_PORT_DESCRIPTORS_H__
 #define __BASEBOARD_PORT_DESCRIPTORS_H__

diff --git a/src/soc/sifive/fu740/include/soc/gpio.h b/src/soc/sifive/fu740/include/soc/gpio.h
index b0466cc..a4d4ecb 100644
--- a/src/soc/sifive/fu740/include/soc/gpio.h
+++ b/src/soc/sifive/fu740/include/soc/gpio.h
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef _SOC_SIFIVE_FU740_GPIO_H_
 #define _SOC_SIFIVE_FU740_GPIO_H_