bindings: hwinfo: Remove deprecated syntax in LiteX DNA binding

Use the new 'compatible:' and 'include:' syntaxes, and clean it up like
for other bindings.

Shorten the description, because it appears in the output as a comment
above the generated macros, and it looks neater. I asked Mateusz what
kind of device it is.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>