Remove duplicated debugfs symlink

* Currently it's created at build-time in rootdir/Android.mk

Test: m
Change-Id: I48e8ebf3412dfdfc2dff3b4fcf9b72de52726865
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 896745b..d5f161d 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -117,9 +117,6 @@
     symlink /system/bin /bin
     symlink /system/etc /etc
 
-    # Backward compatibility.
-    symlink /sys/kernel/debug /d
-
     # Link /vendor to /system/vendor for devices without a vendor partition.
     symlink /system/vendor /vendor