Switch to system/core/janitors as OWNERS.

Change-Id: Ib57af8393bed1d2b1ec8a918e4d9634cadcdef71
diff --git a/OWNERS b/OWNERS
index 67df8da..7529cb9 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +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
+include platform/system/core:/janitors/OWNERS