[otbn] Enable ECDSA P-256 sign/verify test in CI

Signed-off-by: Philipp Wagner <phw@lowrisc.org>
diff --git a/test/systemtest/config.py b/test/systemtest/config.py
index 8b03a84..590b7b2 100644
--- a/test/systemtest/config.py
+++ b/test/systemtest/config.py
@@ -35,13 +35,17 @@
         "verilator_extra_args": ['+OTBN_USE_MODEL=1'],
         "targets": ["sim_verilator"],
     },
-    # The RSA tests can be run in simulation, but take a long time there. Run
-    # them on FPGAs only for faster test results.
+    # The OTBN end-to-end tests can be run in simulation, but take a long time
+    # there. Run them on FPGAs only for faster test results.
     {
         "name": "otbn_rsa_test",
         "targets": ["fpga_nexysvideo"],
     },
     {
+        "name": "otbn_ecdsa_p256_test",
+        "targets": ["fpga_nexysvideo"],
+    },
+    {
         "name": "dif_aes_smoketest",
     },
     {