Azure/GitLab/Travis: Add SPL unit tests

Run SPL unit tests in all test environments.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9ac2b33..b1e0b3b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -198,7 +198,7 @@
   tags: [ 'all' ]
   variables:
     TEST_PY_BD: "sandbox_spl"
-    TEST_PY_TEST_SPEC: "test_ofplatdata or test_handoff"
+    TEST_PY_TEST_SPEC: "test_ofplatdata or test_handoff or test_spl"
   <<: *buildman_and_testpy_dfn
 
 evb-ast2500 test.py: