Telephony: Decode SPN from RuimRecords properly

To address issues with incorrect encoding scheme programmed
in some commercial CSIM cards, the decoded SPN is checked to
have characters in printable ASCII range. If not, they are
decoded with ENCODING_GSM_7BIT_ALPHABET scheme.

Change-Id: I5ae06e0d3df5a3b5b080cc6e69a73daaff92cb10
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