Add janitors to the OWNERS file

Test: TreeHugger
Change-Id: I1733d01ffede6c0aa9ec76c5ed6b5a67b1e69708
diff --git a/OWNERS b/OWNERS
index 3aaf7ad..9e68f12 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,3 @@
 include platform/frameworks/base:/SQLITE_OWNERS
 include platform/libcore:/OWNERS
+include platform/system/core:/janitors/OWNERS #{LAST_RESORT_SUGGESTION}