ethernet: T3048: drop static smp-affinity for dynamic performance tuning

After migrating the ethernet interfaces from the good old Perl days the
smp-affinity node yet has no effect anymore as the code is still missing (my
bad, sorry).

Drop the smp-affinity node and rather use tuned instead with the
network-throughput or network-latency profile.

- network-throughput: Profile for throughput network tuning. It is based on the
  throughput-performance profile. It additionaly increases kernel network buffers.

- network-latency: Profile for low latency network tuning. It is based on the
  latency-performance profile. It additionaly disables transparent hugepages,
  NUMA balancing and tunes several other network related sysctl parameters.

I'd set network-throughput as the default on a new set system option performance
<throughput | latency> CLI node which is present in the default configuration.

https://access.redhat.com/sites/default/files/attachments/201501-perf-brief-low-latency-tuning-rhel7-v2.1.pdf

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