Norway: Rv120 missing

[michih]

Only a short route b/n E6 and Rv22. The rest is Fv120.

Sources:
- https://www.google.com/maps/@59.9971366,11.041994,3a,75y,85.68h,92.94t/data=!3m6!1e1!3m4!1ss3HYczZtTt0f_w4fO1wa7Q!2e0!7i13312!8i6656 (May 2016)
- https://www.vegvesen.no/vegkart/vegkart/#kartlag:geodata/@278761,6656265,12
- https://no.wikipedia.org/wiki/Riksvei_120