Add /config mounting point

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 9d764d2..25463a8 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -23,6 +23,7 @@
     mkdir /system
     mkdir /data 0771 system system
     mkdir /cache 0770 system cache
+    mkdir /config 0500 root root
     mkdir /sqlite_stmt_journals 01777 root root
     mount tmpfs tmpfs /sqlite_stmt_journals size=4m