dm vdo: add hash locks and hash zones

In order to deduplicate concurrent writes of the same data (to different
locations), data_vios which are writing the same data are grouped together
in a "hash lock," named for and keyed by the hash of the data being
written. Each hash lock is assigned to a hash zone based on a portion of
its hash.

Co-developed-by: J. corwin Coburn <[email protected]>
Signed-off-by: J. corwin Coburn <[email protected]>
Co-developed-by: Michael Sclafani <[email protected]>
Signed-off-by: Michael Sclafani <[email protected]>
Co-developed-by: Sweet Tea Dorminy <[email protected]>
Signed-off-by: Sweet Tea Dorminy <[email protected]>
Signed-off-by: Matthew Sakai <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>

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