Add janitors to the OWNERS file

Test: TreeHugger
Change-Id: I17ca1292f48716641f8481ae575a72060ab9ddd5
diff --git a/OWNERS b/OWNERS
index 87a5dbe..41bd4fe 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1 +1,2 @@
 include platform/libcore:/OWNERS
+include platform/system/core:/janitors/OWNERS #{LAST_RESORT_SUGGESTION}