openocd: src: add GPL license tag on files that miss it

Some file miss completely the license tag.

Add the SPDX tag, using the same GPL-2.0-or-later license of the
OpenOCD project.

The SPDX tag on files *.c is incorrect, as it should use the C99
single line comment using '//'. But current checkpatch doesn't
allow C99 comments, so keep using standard C comments, by now.

Change-Id: I1fb51e722232d14f050458a820c3041de3dc9138
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7058
Tested-by: jenkins

src/flash/nor/fm4.c

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /*
  * Spansion FM4 flash
  *

src/jtag/drivers/cmsis_dap.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 #ifndef OPENOCD_JTAG_DRIVERS_CMSIS_DAP_H
 #define OPENOCD_JTAG_DRIVERS_CMSIS_DAP_H
 

src/rtos/linux_header.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 #ifndef OPENOCD_RTOS_LINUX_HEADER_H
 #define OPENOCD_RTOS_LINUX_HEADER_H
 

src/target/openrisc/jsp_server.h

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 #ifndef OPENOCD_TARGET_OPENRISC_JSP_SERVER_H
 #define OPENOCD_TARGET_OPENRISC_JSP_SERVER_H