[Bug 297574] mmcsd: diskinfo returns ID and serial of the reader instead of the inserted card

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297574

--- Comment #3 from Martin Birgmeier <d8zNeCFG@aon.at> ---
After also reading
https://www.cameramemoryspeed.com/sd-memory-card-faq/reading-sd-card-cid-serial-psn-internal-numbers/
, maybe it is impossible to read the card CID via a USB-attached reader.

And maybe the second info I included in my original report was from a machine
with a PCI-connected reader.

I'll leave this open for a little longer for further comments, but this PR
probably should be closed with "cannot be implemented".

-- Martin

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