Add janitors to the OWNERS file

Test: TreeHugger
Change-Id: Id429813cb9e09d1d0743f0f871fb217ebea4776e
diff --git a/OWNERS b/OWNERS
index a4f788d..78b324f 100644
--- a/OWNERS
+++ b/OWNERS
@@ -2,3 +2,4 @@
 ddavenport@google.com
 jstultz@google.com
 seanpaul@google.com
+include platform/system/core:/janitors/OWNERS #{LAST_RESORT_SUGGESTION}