Add permission to set/get persist.vendor.net.doxlat

- Add permission for rild to set and get the property
  persist.vendor.net.doxlat

- Revoke set_prop permission to system_server.

- Define domain for DataConnection HAL

Change-Id: I143bfffa8af61d087d8210516c57a211e25f0a1d
CRs-Fixed: 2425156