Fix initial attach apn bug with OMH profile for LTE

During apn list creation, OMH profiles are queried from sim card and
if found they will be used for initial attach, data call setup. These
OMH profiles are applicable only for Cdma networks, and if used for any
other networks will result in issues. Currently, there is a check to avoid
using OMH profiles for Gsm RATs, but that check is failing for Unknown RAT
case and OMH profiles are being picked up for initial attach request.

Modify the existing condition to check for Cdma network, to make sure OMH
profiles are used only for Cdma.

Change-Id: If88030d2c37069d0a59af9eb096db835095cb804
CRs-Fixed: 794383