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Fix sys/opencrypto/blake2_test when kern.cryptodevallowsoft=0

Description

Fix sys/opencrypto/blake2_test when kern.cryptodevallowsoft=0

Two of these testcases require software crypto to be enabled. Curiously, it
isn't by default.

PR: 230671
Reported by: Jenkins
Reviewed by: cem
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D16755