[Hardy] SRU: enable USB serial support on sparc

[Stefan Bader]

> So perhaps we should do an updateconfigs pass and commit that and then
> apply the real changes from the second hunk as a separate commit.
> 

Well, I would rather go the ..., well lazy, way. Accept that this changes a bit 
more than the absolutely minimum and let the other configs stay the way until 
they get touched for some reason.

Stefan

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