Removing the overwrite logic of sim slot length to mCi's length

This fix was added because of crash that can be seen if “config_num_physical_slots” is not configured properly,
Its the OEM responsibility to configure this property .

Test: b/398782613
Bug: b/396750634
Flag: EXEMPT bug fix
Change-Id: Ia0ce90e5914f30b6b88212e164a742417f39021f