Switch to system/core/janitors as OWNERS.

Change-Id: If587a5d318d240b72fae779f45d5d6564b14567e
diff --git a/OWNERS b/OWNERS
index e32520e..7529cb9 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,5 +1 @@
-# Default code reviewers picked from top 3 or more developers.
-# Please update this list if you find better candidates.
-enh@google.com
-hhb@google.com
-jjaggi@google.com
+include platform/system/core:/janitors/OWNERS