HTCQualcommRIL: correct handling of CDMA + LTE quirk.

The current handling of this quirk just forces a specific
network mode. This breaksGSM mode and network selection on
boot for devices using this flag. To correct this, get the
value from Settings.Global object and set the default value
to CDMA + LTE mode for first boot.

Change-Id: I767d25e96b9cbbdddc486ce696eb95ff14dccb89