Add janitors to the OWNERS file

Test: TreeHugger
Change-Id: I907cf73d22b5331a55efa12cf6756678736df1d5
diff --git a/OWNERS b/OWNERS
index f48a95c..7eb96d1 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1 +1,2 @@
 include platform/frameworks/av:/camera/OWNERS
+include platform/system/core:/janitors/OWNERS #{LAST_RESORT_SUGGESTION}