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kern: racct: Remove code unused since %cpu resource computation revamp

Description

kern: racct: Remove code unused since %cpu resource computation revamp

Reviewed by: emaste, markj
Fixes: c72188d85a79 ("racct: Improve handling of the pcpu resource")
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D54284

(cherry picked from commit 55ce12672b948c002431851af54843bfc7f50d6f)