[Tizen ] Enable sim support for 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
Quote 'If a non-volatile const static data member is of integral or enumeration type, its declaration in the class deﬁnition can specify a brace-or-equal-initializer'. It means it only suits to 'integral or enumeration type'. But here, we use <code>std::string</code> type. That is why it has errors when removing to header file. I did a test. If we use <code>int</code> type, it does can build successfully.