net: dsa: sja1105: stop reporting the queue levels in ethtool port counters

The queue levels are not counters, but instead they represent the
occupancy of the MAC TX queues. Having these in ethtool port counters is
not helpful, so remove them.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>