Updated APN settings for Latvian operators

Sources:
https://www.lmt.lv/lv/interneta-lietosana (section: Kadi ir LMT mobila interneta un MMS parametri?)
http://www.tele2.lv/internets/internets-telefonam/ (section: Interneta iestatijumi)
http://www.bite.lv/palidziba/palidziba/interneta-iestatijumi-telefona (section: Android telefonam)

Change-Id: I7a1ef2ce90f2e0b6a9d59f6e4393b3ec2e59fdb9