Add janitors to the OWNERS file

Test: TreeHugger
Change-Id: Id2277e8cc6039e41543f043b20890e6509676489
diff --git a/OWNERS b/OWNERS
index f37daeb..34fe260 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,3 @@
 set noparent
 file:platform/system/bpf:main:/OWNERS_bpf
+include platform/system/core:/janitors/OWNERS #{LAST_RESORT_SUGGESTION}