core: added national roaming info for Tesco Mobile in Ireland.

Users of Tesco Mobile in Ireland(MCC 272 MNC 11)
  can roam on O2 Ireland (MNC 02)

Change-Id: Ie0b32d51511c2bbc726c43cdec78332397d1ecb9
Merge pull request #5 from CyanogenMod/cm-11.0

core: added national roaming info for Tesco Mobile in Ireland.