[Bug 222807] PURE entropy sources are harvested but not mixed in. Also, min-entropy low per SP800-90B measurements

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222807

--- Comment #1 from W. Dean Freeman <badfilemagic at gmail.com> ---
Created attachment 186933
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=186933&action=edit
patch to increase the min-entropy

Makes sure that we only feed the first 8-12 bytes of the harvest_event hash
since otherwise we are including predictable/repeat bytes which decrease
min-entropy when measured per guidance from US NIST in SP800-90B

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