Add VSCode task for running tests with TF-A.

Change-Id: Id279269b01b83f77bc824ce22b57e6b0d479e5dd
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 908ac5e..53ed8f9 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -42,6 +42,11 @@
             "command": "make && kokoro/test.sh --fvp"
         },
         {
+            "label": "test with TF-A",
+            "type": "shell",
+            "command": "make && kokoro/test.sh --tfa"
+        },
+        {
             "label": "push",
             "type": "shell",
             "command": "git push origin HEAD:refs/for/master",