Bug 973450 - [settings] refactor Device information panel with AMD patte...

...rn
https://github.com/mozilla-b2g/gaia/pull/26170/files#diff-4303fc2346067e696f80e4556d70027dR61

In `_factoryReset`, there might be a chance that we don't have `mozReset` or `mozReset.factoryReset`, if we did need the check there, then I think we should be able to fallback to make UI interactive in such scenario.