remove the "clustering" flag

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The block layer has been carrying around a magic clustering flag,
which is an artefact of prehistoric scsi layer design decisions.

Originally it controller if any segment merging happens at all for a
given LLLD, but with merging moving to the block layer and massively
more complex now it now essentically means that no segment shall be
larger than a page, and no segment shall cross a page boundary if
clustering is not enabled.  Unfortunately the SCSI layer historically
defaults to disabled clustering, but fortunately most drivers actually
enable it, and very few drivers do not set an explicit flag.

So this series first flips the default to be sensible, and then replaces
the magic flag with setting an explicit dma boundary and max segment
size to reuse the existing mechanisms.  It also fixes up a few drivers
where the no clustering setting was clearly bogus, although we can
probably lift these limits for others as well eventually.



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