Merge branch 'mv88e6390-initial-support'

Andrew Lunn says:

====================
Start adding support for mv88e6390

This is the first patchset implementing support for the mv88e6390
family.  This is a new generation of switch devices and has numerous
incompatible changes to the registers. These patches allow the switch
to the detected during probe, and makes the statistics unit work.

These patches are insufficient to make the mv88e6390 functional. More
patches will follow.

v2:
  Move stats code into global1
  Change DT compatible string to mv88e6190
  Fixed mv88e6351 stats which v1 had broken
====================

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