Merge branch 'net-phy-marvell-usb-to-mdio-controller'

Tobias Waldekranz says:

====================
net: phy: marvell usb to mdio controller

Support for an MDIO controller present on development boards for
Marvell switches from the Link Street (88E6xxx) family.

v3->v4:
- Remove unnecessary dependency on OF_MDIO.

v2->v3:
- Rename driver smi2usb -> mvusb.
- Clean up unused USB references.

v1->v2:
- Reverse christmas tree ordering of local variables.
====================

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