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
You mean <code>name_</code>? <code>name_</code> is used as the <code>key</code> in <code>SysInfoClassMap</code>. We can compare <code>prop</code> name with <code>name_</code> to indicate which <code>instance</code>'s method is called.