[LICENSE] Add SPDX Identifier

gds/gds2mag-all.sh

diff --git a/gds/gds2mag-all.sh b/gds/gds2mag-all.sh
index a7160b2..2f816a1 100755
--- a/gds/gds2mag-all.sh
+++ b/gds/gds2mag-all.sh
@@ -12,6 +12,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+# SPDX-License-Identifier: Apache-2.0
 
 
 

gds/gen_caravel.tcl

diff --git a/gds/gen_caravel.tcl b/gds/gen_caravel.tcl
index eadca1d..322a304 100644
--- a/gds/gen_caravel.tcl
+++ b/gds/gen_caravel.tcl
@@ -8,6 +8,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+# SPDX-License-Identifier: Apache-2.0
 
 drc off
 gds readonly true