Add Zircon

Change-Id: I8e88c3dc31e50dea961487d24b4661354f551e45
diff --git a/scripts/gitsync/list-of-repos.txt b/scripts/gitsync/list-of-repos.txt
index c5e35c9..6baae9f 100644
--- a/scripts/gitsync/list-of-repos.txt
+++ b/scripts/gitsync/list-of-repos.txt
@@ -216,3 +216,4 @@
 wlan
 xi
 zip
+zircon