telephony: set PROPERTY_DATA_NETWORK to data technology

The GSM SS is inaccurately setting the property to voice technology
instead of data technology (CDMA's SS is correct.)

(Reapply: last match lost in the merge)

Change-Id: Id4e02bb0e0e4a757fba78f3501d6b776d3af558c
Merge "telephony: set PROPERTY_DATA_NETWORK to data technology" into cm-10.2