net: phy: Add PHY driver for mv88e61xx switches

net: phy: Add PHY driver for mv88e61xx switches

The previous mv88e61xx driver was a driver for configuring the
switch, but did not integrate with the PHY/networking system, so
it could not be used as a PHY by U-boot.  This is a complete
rework to support this device as a PHY.

Signed-off-by: Kevin Smith <[email protected]>
Acked-by: Prafulla Wadaskar <[email protected]>
Cc: Albert ARIBAUD <[email protected]>
Cc: Joe Hershberger <[email protected]>
Cc: Stefan Roese <[email protected]>
Cc: Marek Vasut <[email protected]>
Acked-by: Joe Hershberger <[email protected]>