CI: Run VPL tests

Add tests for VPL into the mix. For now this just runs the help test and
a few SPL ones.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/.azure-pipelines.yml b/.azure-pipelines.yml
index 48a587a..4e5c4b7 100644
--- a/.azure-pipelines.yml
+++ b/.azure-pipelines.yml
@@ -245,6 +245,9 @@
         sandbox_spl:
           TEST_PY_BD: "sandbox_spl"
           TEST_PY_TEST_SPEC: "test_ofplatdata or test_handoff or test_spl"
+        sandbox_vpl:
+          TEST_PY_BD: "sandbox_vpl"
+          TEST_PY_TEST_SPEC: "test_vpl_help or test_spl"
         sandbox_noinst:
           TEST_PY_BD: "sandbox_noinst"
           TEST_PY_TEST_SPEC: "test_ofplatdata or test_handoff or test_spl"