Mount schedTune cgroup as /dev/stune

Make stune consistent with the other cgroups mounted under /dev

Change-Id: I0fe7120ad2afbe8e6a3c9f72cc3f465de618d344
diff --git a/rootdir/init.zygote32_64.rc b/rootdir/init.zygote32_64.rc
index 04b8854..555eda4 100644
--- a/rootdir/init.zygote32_64.rc
+++ b/rootdir/init.zygote32_64.rc
@@ -13,4 +13,4 @@
     class main
     socket zygote_secondary stream 660 root system
     onrestart restart zygote
-    writepid /dev/cpuset/foreground/tasks /sys/fs/cgroup/stune/foreground/tasks
+    writepid /dev/cpuset/foreground/tasks /dev/stune/foreground/tasks