kobo/device: Add field for natural light support
kobo/device: Add field for natural light support

Currently, only the Kobo Aura One has natural light.

Frenzie/koreader,koreader/koreader,poire-z/koreader,apletnev/koreader,NiLuJe/koreader,lgeek/koreader,Markismus/koreader,poire-z/koreader,NiLuJe/koreader,Hzj-jie/koreader,Frenzie/koreader,mwoz123/koreader,pazos/koreader,houqp/koreader,koreader/koreader,mihailim/koreader