base: added national roaming info for Play in Poland

Cherry-picked from OmniROM:
https://gerrit.omnirom.org/#/c/3382/

Users of Play in Poland (MCC 260 MNC 06) can roam on
Plus, T-Mobile, Orange (MNCs 01/02/03)

Change-Id: I8ea62b0ca40bac9ced11802ee8ef583d6392a199
core: added national roaming info for Free Mobile in France

  Users of Free Mobile in France (MCC 208 MNC 15)
  can roam on Orange (MNC 01)

Change-Id: I2c0c3940a72262b1257fb1c2dfdd01da652d2959
National roaming info for Drei in Austria

3AT roams in T-Mobile AT networks

Change-Id: I915edccf92bcbb088fa25b958eb345c624f61597