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Replace rss_m2cpuid with rss_soft_m2cpuid_v4 for ip_direct_nh.nh_m2cpuid,

Description

Replace rss_m2cpuid with rss_soft_m2cpuid_v4 for ip_direct_nh.nh_m2cpuid,
because the RSS hash may need to be recalculated.

Submitted by: Tiwei Bie <btw@mail.ustc.edu.cn>
Differential Revision: https://reviews.freebsd.org/D3564