Fix "Set up Wi-Fi NFC Tag" dialog cannot be scrolled

"Set up Wi-Fi NFC Tag" dialog cannot be scrolled and "Show password"
is not displayed when setting Font size and Display size to Largest.
To fix this issue, ScrollView should be added.

Fixes: 66936807
Test: manual - long tap a connected Wi-Fi AP and
               tap "Write to NFC tag".

Change-Id: I3edcf3c2b9db47319e18405066bcb835b064b690