Add a "data during calls" preference

This adds a switch which appears on the SIM details page for any SIMs
that aren't the default on for data. It lets the user opt-in to turning
on data on this SIM only in the case where there is an active call -
this is needed because in some cases the default data SIM may not be
able to be used when a call is active on another SIM.

Bug: 132114205
Test: make RunSettingsRoboTests
Change-Id: Ie44c56e0f486fd93aff411a0ba0e47d3695a4941