Merge branch 'net-smc-add-and-delete-link-processing'

Karsten Graul says:

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net/smc: add and delete link processing

These patches add the 'add link' and 'delete link' processing as
SMC server and client. This processing allows to establish and
remove links of a link group dynamically.

v2: Fix mess up with unused static functions. Merge patch 8 into patch 4.
    Postpone patch 13 to next series.
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Signed-off-by: David S. Miller <davem@davemloft.net>