Add mimetype for Devicetree source code and binary

Merged StefanBruens requested to merge StefanBruens/shared-mime-info:add_devicetree into master

Make sure at least the first two characters are ASCII, to guard against any binary files. The maximum offset is fairly large, as many files start with a large license stanza.

Fixes #173 (closed)

Also add Flattened Devicetree files (dtb).

Edited by StefanBruens

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