…quality

Moved methods to classes CellularDevice and CellularInformation.
SIM interface was removed to simplify cellular usage and
methods better suite new classes.
Updated greentea and unit tests.

-added an API for checking network eps ciot optimization support
-renamed the API for getting the UE parameters
-the API for setting the UE parameters includes now a callback, which
will be called once network support for eps ciot optimization is known

Cellular: Remove sim interface

…n_feature_branch

Cellular ciot eps on feature branch

Cell refactor power api

Cellular: changed support features to CellularProperty array.

After this change we were able to change methods
ATHandler::set_urc_handler and CellularDevice::set_ready_cb to void
and simplify error handling.

Cellular: Removed unnecessary checks after new

This change enables removing function has_registration from
class AT_CellularNetwork and all targets inheriting
AT_CellularNetwork.

After AT_CellularNetwork::has_registration was replaced with
CellularProperties and better
AT_CellularNetwork::set_access_technology_impl default
implementation we can delete most of the target specific classes
that inherit AT_CellularNetwork.

Change usage of AT_CellularContext::stack_type_supported to
AT_CellularBase::get_property. This way we can rid of
targets overriding stack_type_supported and delete
unnecessary classes and simplify new targets.

Generic cellular module (GENERIC_AT3GPP) can by used as a default
module when porting new cellular module. It's a good starting point
and eases porting of new modules. GENERIC_AT3GPP uses only standard
3GPP AT commands when communicating with the modem.

_sim_pin was changed to pointer from array and length was checked with
strlen. If _sim_pin was null it caused crash. Fix by checking _sim_pin against NULL.
Power class could have been called without checking if power is NULL. Fix by checking
that power class is not null.
Fix state machine to return correct states when queried.

Cellular: Add generic cellular modem

Cellular: added setting of data carrier support for UART.

…livery

…efactor_nonip

Cellular: Non-IP socket and PDP context for EPS control plane data de…