Add janitors to the OWNERS file

Test: TreeHugger
Change-Id: I71763616d03e9db774d202779a96d0cf319cdc24
diff --git a/OWNERS b/OWNERS
index c24680e..9310bff 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,3 @@
 set noparent
 file:platform/packages/modules/Connectivity:main:/OWNERS_core_networking
+include platform/system/core:/janitors/OWNERS #{LAST_RESORT_SUGGESTION}