fix blk-mq for SPI hosts

[Christoph Hellwig]

Fix the assumption that we can treat all blk-mq requests as tagged.  For
traditional SCSI that's wrong, as being tagged has a very explicit meaning
on the wire.

This is a little bit different from the version Meelis tested earlier, but
the concept is the same.  I didn't want to add a Tested-by tag as it's
different enough, though.

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