Merge branch 'dsa-Add-ATU-VTU-statistics'

Andrew Lunn says:

====================
Add ATU/VTU statistics

Previous patches have added basic support for Address Translation Unit
and VLAN translation Unit violation interrupts. Add statistics
counters for when these occur, which can be accessed using
ethtool. Downgrade one of the particularly spammy warnings from VTU
violations to debug only, now that we have a counter for it.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>