RFC: new USB quirk

[Marcel Moolenaar]

Hans,

Juniper has a few products that use STmicro USB-NAND controllers
(the ST72682 in particular) and they really don't like the SCSI
command for prevent/allow medium removal. The attached patch
adds a quirk for this to avoid spamming the console with errors
or warnings.

Does it look good to you?
Ok to commit?

Thanks,

-- 
Marcel Moolenaar
marcel at xcllnt.net

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