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
It doesn't work. If you directly move the define to the header file but outside of the class. It will produce multiple definition of <code>SysInfoSim::name_</code> error. If you define it when declaring in the class, it will produce <code>non-constant in-class initialization invalid for static member SysInfoSim::name_</code>