tcl: 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 | 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: Ief3da306a6e1978de7dfb8f552f9ff23151f9944
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7030
Tested-by: jenkins

tcl/chip/st/spear/quirk_no_srst.tcl

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
 # Quirks to bypass missing SRST on JTAG connector
 # EVALSPEAr310 Rev. 2.0
 # http://www.st.com/spear

tcl/chip/st/spear/spear3xx.tcl

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
 # Generic init scripts for all ST SPEAr3xx family
 # http://www.st.com/spear
 #

tcl/chip/st/spear/spear3xx_ddr.tcl

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
 # Init scripts to configure DDR controller of SPEAr3xx
 # http://www.st.com/spear
 # Original values taken from XLoader source code