Merge branch 'bcm7278'

Florian Fainelli says:

====================
net: dsa: bcm_sf2: Add support for BCM7278

This patch series adds support for the Broadcom BCM7278 integrated switch
which is a successor of the BCM7445 switch. We have a little bit of
register shuffling going on, which is why most of the functional changes
are to deal with that.
====================

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