lg-{lenok,dory}: modernize and add AsteroidOS machine config

Bart Ribbers requested to merge lg-lenok-asteroid into master

AsteroidOS uses this config file to determine how the UI should look (e.g. a round or a square screen), and if some things like Wi-Fi are supported. Upstream auto generates this config file, but it seems so simple and small that I think it's better for us to just ship the file next to the APKBUILD

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