Bug 861081 -  [Gaia][Settings] Use new WebAPI to access SIM lock functionality

Please see [bug 861081](https://bugzilla.mozilla.org/show_bug.cgi?id=861081).

In [bug 860585](https://bugzilla.mozilla.org/show_bug.cgi?id=860585), we move cardLock related API from mozMobileConnection to mozIccManager. This pull request is to do corresponding changes in Gaia side.

Thanks