meta-google: Add wltu as Maintainer

Change-Id: Ia2ff2feefd083e64756f3d135083aec0b97eb07e
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/meta-google/OWNERS b/meta-google/OWNERS
index 6608f2e..4a63ee6 100644
--- a/meta-google/OWNERS
+++ b/meta-google/OWNERS
@@ -4,3 +4,4 @@
 - benjaminfair@google.com
 - edtanous@google.com
 - brandonkim@google.com
+- wltu@google.com