init.rc: Add a new schedtune group 'rt' for rt tasks

Add a new boost group for rt tasks. Device specific changes will be in
the device init rc.

Bug: 33085313

Change-Id: I99ca085d0933d878795bb0eda639bb2075419415
Signed-off-by: Joel Fernandes <joelaf@google.com>
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 944aae7..a224d5e 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -52,18 +52,22 @@
     mkdir /dev/stune/foreground
     mkdir /dev/stune/background
     mkdir /dev/stune/top-app
+    mkdir /dev/stune/rt
     chown system system /dev/stune
     chown system system /dev/stune/foreground
     chown system system /dev/stune/background
     chown system system /dev/stune/top-app
+    chown system system /dev/stune/rt
     chown system system /dev/stune/tasks
     chown system system /dev/stune/foreground/tasks
     chown system system /dev/stune/background/tasks
     chown system system /dev/stune/top-app/tasks
+    chown system system /dev/stune/rt/tasks
     chmod 0664 /dev/stune/tasks
     chmod 0664 /dev/stune/foreground/tasks
     chmod 0664 /dev/stune/background/tasks
     chmod 0664 /dev/stune/top-app/tasks
+    chmod 0664 /dev/stune/rt/tasks
 
     # Mount staging areas for devices managed by vold
     # See storage config details at http://source.android.com/tech/storage/