The AT+CRSM=192 commands are failing on HSO devices and thus it might
be needed to return its details from a predefined database. Start with
testing this for reading the network code length.
Add ofono_sim_inserted_notify function to notify the core of SIM
insertion / removal.
Make every plugin generate a sim inserted event on start. For devices
with removable card, the event should be emitted after the
plugin detects such event. For devices that need to wait for SIM card
initialization, they can emit this event later.
The Application port gets all unsolicited notifications except for
OWANCALL notifications. In turn only the Control port gets OWANCALL
notifications.
This means that we run GPRS Context control on the Control port and
network registration / sms on the application port