Correctly provide the technology to setup data connection

This commit allows to correctly manage GSM data connection on legacy
RILs and provides a better readable method to get the technology that
will be used to setup data connection.

Change-Id: Ide4e5d193a35d6f02c5320fe8afe9a24659c97d9
Merge remote-tracking branch 'cm/cm-12.0' into HEAD