tcl/target: add SPDX tag

For historical reasons, no license information was added to the
tcl files. This makes trivial adding the SPDX tag through script:
	fgrep -rL SPDX tcl/ target| while read a;do \
	sed -i '1{i# SPDX-License-Identifier: GPL-2.0-or-later\n
	}' $a;done

With no specific license information from the author, let's extend
the OpenOCD project license GPL-2.0-or-later to the files.

Change-Id: I7b2610300b24cccd07bfa6fb5f1266970d5d3a1b
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7027
Tested-by: jenkins

tcl/target/rk3308.cfg

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
 # Rockchip RK3308 Target
 # https://rockchip.fr/RK3308%20datasheet%20V1.5.pdf
 # https://dl.radxa.com/rockpis/docs/hw/datasheets/Rockchip%20RK3308TRM%20V1.1%20Part1-20180810.pdf