startop: Add yawanng@ to OWNERS list

Change-Id: Iaee1a3d608593238284c9b07d34d1042538ec612
diff --git a/startop/OWNERS b/startop/OWNERS
index 5cf9582..3394be9 100644
--- a/startop/OWNERS
+++ b/startop/OWNERS
@@ -4,3 +4,4 @@
 iam@google.com
 mathieuc@google.com
 sehr@google.com
+yawanng@google.com