Refine CrossSimCalling updating

Currently, this setting depends on whether wifi calling is supported,
since wifi calling could takes some time to provision after sim is
turned on, this state could be wrong when set cross sim calling.

Use wifiCallingReadyFlow() to retrieve the latest state, and update
setting when state changes.

Fix: 352736998
Fix: 348529996
Flag: EXEMPT bug fix
Test: manual - by turn on / off sim
Change-Id: Id4b099e0c5d7cf47b007f37e6f278d1c46e58659