Add playground OWNERS to FLAN playground settings.gradle

Test: N/A
Change-Id: Ibed944df4bf0bb04faf2a6adcc07a5cf9f85de15
diff --git a/navigation/OWNERS b/navigation/OWNERS
index 1dcd21e..5245ec9 100644
--- a/navigation/OWNERS
+++ b/navigation/OWNERS
@@ -2,3 +2,6 @@
 jbwoods@google.com
 danysantiago@google.com
 sergeyv@google.com
+
+per-file settings.gradle = dustinlam@google.com, rahulrav@google.com
+