net: marvell: prestera: Propagate nh state from hw to kernel

We poll nexthops in HW and call for each active nexthop appropriate
neighbour.

Also we provide implicity neighbour resolving.
For example, user have added nexthop route:
  # ip route add 5.5.5.5 via 1.1.1.2
But neighbour 1.1.1.2 doesn't exist. In this case we will try to call
neigh_event_send, even if there is no traffic.
This is useful, when you have add route, which will be used after some
time but with a lot of traffic (burst). So, we has prepared, offloaded
route in advance.

Co-developed-by: Taras Chornyi <[email protected]>
Signed-off-by: Taras Chornyi <[email protected]>
Co-developed-by: Oleksandr Mazur <[email protected]>
Signed-off-by: Oleksandr Mazur <[email protected]>
Signed-off-by: Yevhen Orlov <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>

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