Merge branch 'mvneta-xdp-ethtool-stats'

Lorenzo Bianconi says:

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add xdp ethtool stats to mvneta driver

Rework mvneta stats accounting in order to introduce xdp ethtool
statistics in the mvneta driver.
Introduce xdp_redirect, xdp_pass, xdp_drop and xdp_tx counters to
ethtool statistics.
Fix skb_alloc_error and refill_error ethtool accounting
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Signed-off-by: David S. Miller <davem@davemloft.net>