rootdir: add ueventd.rc rule for adf subsystem

Change-Id: I727d91355229692c11e0e309c0fcac051269eba3
Signed-off-by: Greg Hackmann <ghackmann@google.com>
diff --git a/rootdir/ueventd.rc b/rootdir/ueventd.rc
index a60cfc5..ddf8753 100644
--- a/rootdir/ueventd.rc
+++ b/rootdir/ueventd.rc
@@ -1,3 +1,6 @@
+subsystem adf
+	devname uevent_devname
+
 /dev/null                 0666   root       root
 /dev/zero                 0666   root       root
 /dev/full                 0666   root       root