Add CtsVcnTestCases to presubmit

Test: atest CtsVcnTestCases
Test: Treehugger runs CtsVcnTestCases
Change-Id: I4c60ddc3afd3ecc3474dfb67aecdbf4b953fd9fc
diff --git a/tests/tests/vcn/TEST_MAPPING b/tests/tests/vcn/TEST_MAPPING
new file mode 100644
index 0000000..f8ac08c
--- /dev/null
+++ b/tests/tests/vcn/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "presubmit": [
+    {
+      "name": "CtsVcnTestCases"
+    }
+  ]
+}
\ No newline at end of file