mlx5e-updates-2018-12-14 (VF Lag)

From Aviv Heller,

Subsequent patches introduce VF LAG, which provdies load-balancing and
high-availability capabilities for VFs associated with different
physical ports of the same Connect-X card.

This series consists of the following:
 - mlx5 devcom, driver infrastructure that facilitates operations that involve
   both core devices (physical functions) of the same card, to synchronize and
   communicate between two driver instances of the same card.
 - Infrastructure for TC rule duplication.
 - Changes to LAG logic to enable its use when SR-IOV is enabled
 - PFs in switchdev mode is the only mode currently supported.
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