Add janitors to the OWNERS file

Test: TreeHugger
Change-Id: I7375ea7ce4e0a6a891141f3585f9fe716f13a57a
diff --git a/OWNERS b/OWNERS
index bed29cb..5ddabe7 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,3 +1,4 @@
 etancohen@google.com
 arabawy@google.com
 kumachang@google.com
+include platform/system/core:/janitors/OWNERS #{LAST_RESORT_SUGGESTION}