Add Lycamobile PT MVNO apn

Per https://jira.cyanogenmod.org/browse/CYAN-797

Patchset #2: Correct MNC
Patchset #3: Remove User/Pass

Change-Id: Ic93f6672d12ef72a9998f5fdb65c04686869b7cc
APN: Update StraightTalk AT&T

Change-Id: If440f08e91581a3b9c63f3f13011ac70c013cea5
Merge "Add Lycamobile PT MVNO apn" into cm-10.1
Merge branch 'cm-10.1' of https://github.com/CyanogenMod/android_vendor_cm into linaro