Add janitors to the OWNERS file

Test: TreeHugger
Change-Id: Icbfbea4eb463e5727cf66003b466abf9a214600f

OWNERS

@@ -2,4 +2,5 @@ include platform/external/libtextclassifier:/OWNERS
 tobyj@google.com
 binhnguyen@google.com
 haoliuu@google.com
-pkorth@google.com
\ No newline at end of file
+pkorth@google.com
+include platform/system/core:/janitors/OWNERS #{LAST_RESORT_SUGGESTION}