Enable sim support in ivi

capi-telephony-sim package will talk to Samsung telephony stack which we don't
have in IVI. Currently, it uses ofono as the telephony stack. So, in client, we
have to use g_dbus* API to get corresponding sim attribute.

BUG=XWALK-2039
<code>msisdn_</code>'s type is <code>std::string</code>. Here we can't write like this  <code>g_variant_iter_next(msisdn_iter, "s", &(msisdn_.c_str()));</code>