Merge branch 'mlxsw-Reject-unsupported-FIB-configurations'

Ido Schimmel says:

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mlxsw: Reject unsupported FIB configurations

Recently it became possible for listeners of the FIB notification chain
to veto operations such as addition of routes and rules.

Adjust the mlxsw driver to take advantage of it and return an error for
unsupported FIB rules and for routes configured after the abort
mechanism was triggered (due to exceeded resources for example).

v2:
* Change error code in first patch to -EOPNOTSUPP (David Ahern).
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Signed-off-by: David S. Miller <davem@davemloft.net>