Arthur: trigger arthur-tf-sync-repos on patch submit

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: I700b8622fea3a2b439cfe992b7da5cd955d8ac38
diff --git a/arthur-tf-sync-repos.yaml b/arthur-tf-sync-repos.yaml
index 354a963..8d804c6 100644
--- a/arthur-tf-sync-repos.yaml
+++ b/arthur-tf-sync-repos.yaml
@@ -26,6 +26,7 @@
         server-name: review.trustedfirmware.org
         trigger-on:
         - ref-updated-event
+        - patchset-uploaded-event
         projects:
         - project-compare-type: PLAIN
           project-pattern: sandbox/arthur