collectd: Fix various issues with lantiq dsl metrics.

- Handle bool values correctly. We get the values as bool, but collectd
  requires a bool value to be numeric in the range [0, 1].
- Remove profile and mode values. Those are strings, which cannot be
  represented by collectd.
- Update collectd type for some values.
- Fix latn value being present twice.

Signed-off-by: Dominik Riebeling <bluebrother@posteo.de>