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
telephony: pick correct APN for MSim

The subId should be sent to TelephonyProvider to pick the correct
preferred APN. Without it, the first APN will simply gets used.

For non-MSim, sending subId shouldn't break anything (Settings send
it anyway)

Change-Id: I837e33391b39bf9bc0b7af06840bfe899c6ffcb7