Add hwbinder dev node permissions.

Change-Id: I8ec92a29287b17636c363c55a8565dacab19043d
(cherry picked from commit e029e7c03dd798e70b5c3e5efdffb84c7f64a417)
diff --git a/rootdir/ueventd.rc b/rootdir/ueventd.rc
index 6ef491c..bf87b43 100644
--- a/rootdir/ueventd.rc
+++ b/rootdir/ueventd.rc
@@ -19,6 +19,7 @@
 /dev/hw_random            0440   root       system
 /dev/ashmem               0666   root       root
 /dev/binder               0666   root       root
+/dev/hwbinder             0666   root       root
 
 # Anyone can read the logs, but if they're not in the "logs"
 # group, then they'll only see log entries for their UID.