Fix Wi-Fi calling option does not appear

After turning on non-DDS sim.

This is because IMS feature takes time to provisioning, and IMS takes
time to become ready.

Before this fix, we do not observe the status.
After this fix, observe the readiness to fix.

Fix: 325414275
Test: manual - turn DSDS on - off
Test: unit tests
Change-Id: If10abdb331da1ff8310e10681d055d7fbe04eaee