Add janitors to the OWNERS file

Test: TreeHugger
Change-Id: Id03a6e7a07a4dce2099da51e37478448785616b1
diff --git a/OWNERS b/OWNERS
index 188932d..e85137c 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,3 @@
 dwillemsen@google.com
 ccross@google.com
+include platform/system/core:/janitors/OWNERS #{LAST_RESORT_SUGGESTION}