Update OWNERS to reference libcore's OWNERS file

Update OWNERS to reference libcore's OWNERS file

Test: ls ../../libcore/OWNERS
Change-Id: I467d6c22dfce6e038522ac91d29d109322d47384
diff --git a/OWNERS b/OWNERS
index 5c6aa31..17cb81c 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1 @@
-nfuller@google.com
-paulduffin@google.com
+include ../../libcore/OWNERS