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
National roaming info for Drei in Austria

3AT roams in T-Mobile AT networks

Change-Id: I915edccf92bcbb088fa25b958eb345c624f61597
National roaming info for yesss! in Austria

Change-Id: I930198d3cb311b23752a8c2f54852ebd48d65b86
National roaming info for 3 in Ireland

Change-Id: I451831f4144b72feac1a38ef1e8693cb947d6d7e