[Settings] init UI entry for Cross SIM calling

Create an empty UI entry for Cross SIM calling.

TODO: fill-in implementation based on UI within document.

Document:
https://docs.google.com/document/d/1INEwrq5_M62hJcRMshdO0OaFruVR0goYByxdpMdFr_o/edit?disco=AAAAHQo7ang&ts=5fadc9b4&usp_dm=true#heading=h.8gw4a7e503pz

Bug: 174012397
Test: manual
Change-Id: I344a18954924c4665295ef244bfee773f3f98d55