Add back permissions for ttyHSL0

* Required for a2dp

Change-Id: Iceb9b8b49262110abfb5c22f27a920764ff2c2bc
Create /data/radio used by RIL

* This was previously done in init.rc, but must now be done
  in device specific script.

Change-Id: I5f0beb2bcb57023f11f70526ab6c19fcedb90aef