[rilmodem][WIP] Implementing call forwarding registration

Bringing call forwarding registration to rilmodem.

Signed-off-by: jussi.kangas@tieto.com
Merge pull request #21 from ptakalok/master

request to merge this feature
Merge pull request #22 from jkangas/master

Request for pulling call forwarding registration to rilmodem
[PATCH] [rilmodem][WIP] Enabling getting and setting CLIR

Enabling getting and setting of Calling line identification restriction


Signed-off-by: Petri Takalokastari <petri.takalokastari@oss.tieto.com>