Add zhangkelvin@ as owner

Change-Id: I9eb586950ce817a776fd9401d58dc473bbc160b8
diff --git a/OWNERS b/OWNERS
index bde12bf..de970a0 100644
--- a/OWNERS
+++ b/OWNERS
@@ -3,6 +3,7 @@
 # Android
 senj@google.com
 xunchang@google.com
+zhangkelvin@google.com
 
 # Chrome OS
 kimjae@google.com
\ No newline at end of file