Add yiyiyang to OWNERS

Bug: N/A
Test: N/A
Change-Id: I6164a24034c4b242e39b284c2ac12619bd833eea
diff --git a/OWNERS b/OWNERS
index 636e5fd..14b3742 100644
--- a/OWNERS
+++ b/OWNERS
@@ -3,3 +3,4 @@
 shiufai@google.com
 mosescu@google.com
 allight@google.com
+yiyiyang@google.com