update OWNERS for vts related projects

Bug: none
Test: none
Change-Id: Iac97bb99b57af7e762c08539d4d2faebccbc5af5
diff --git a/OWNERS b/OWNERS
index 6a26ae7..9aa2549 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,3 @@
 yim@google.com
 zhuoyao@google.com
+guangzhu@google.com