Mike Snitzer 9958f1d9a0 dm cache: remove all obsolete writethrough-specific code
Now that the writethrough code is much simpler there is no need to track
so much state or cascade bio submission (as was done, via
writethrough_endio(), to issue origin then cache IO in series).

As such the obsolete writethrough list and workqueue is also removed.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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