[rilmodem][WIP] Enabling emergency call when no ICC

Enabled showing the voice call API in dbus interface when there
is no ICC. Enabled passing the online check made by ofono core when
call is made

Signed-off-by: Jussi Kangas <jussi.kangas@oss.tieto.com>
Merge pull request #34 from jkangas/master

Request for pulling the support for emergency call when no ICC to main branch