[dif/otp_ctrl] Add smoke tests for otp_ctrl DIFs.

Signed-off-by: Miguel Young de la Sota <mcyoung@google.com>
diff --git a/test/systemtest/config.py b/test/systemtest/config.py
index 9983cba..4444c6c 100644
--- a/test/systemtest/config.py
+++ b/test/systemtest/config.py
@@ -37,6 +37,9 @@
 #        "targets": ["sim_verilator"],
 #    },
     {
+        "name": "dif_otp_ctrl_smoketest",
+    },
+    {
         "name": "dif_plic_sanitytest",
     },
     {