Change license to BSD-2-Clause

This was announced on the Tillitis Blog the 2nd of October 2024, for
more info visit https://tillitis.se

hw/application_fpga/tools/run_pnr.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # SPDX-FileCopyrightText: 2025 Tillitis AB <tillitis.se>
-# SPDX-License-Identifier: GPL-2.0-only
+# SPDX-License-Identifier: BSD-2-Clause
 
 help() {
     echo "Usage: $(basename $0) [OPTION]"