Merge branch 'net-call-for-phys_port_name-into-devlink-directly-if-possible'

Jiri Pirko says:

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net: call for phys_port_name into devlink directly if possible

phys_port_name may be assembled by a helper in devlink. It is currently
the case only for mlxsw driver. Benefit from the get_devlink_port ndo
and call into devlink directly from dev_get_phys_port_name(). That saves
the trip to the driver, simplifies the code and makes it similar to
recently introduced ethtool-devlink compat helpers.

Move bnxt, partly nfp and dsa to let devlink core generate the name too.
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Signed-off-by: David S. Miller <davem@davemloft.net>