IMS: Update default Wifi calling mode during power up

If user powered up with WFC editable SIM card and modify the
WFC preference, and rebooted the device with a non editable WFC
SIM card, then user will not have a choice to pickup the default
WFC mode.

To fix this issue, update default WFC mode during power up,
if WFC UI option is non editable for inserted SIM card.

Test: manual - Checked that WFC mode was changed to default with a non
editable WFC SIM card
Bug: 37621367

Change-Id: Ib47022e23fafc5ea1b4424605577cf11ed0a1b6b