phy: micrel: add Microchip KSZ 9477 Switch PHY support

Adding Microchip 9477 Phy included in KSZ9477 Switch.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Woojung Huh <Woojung.Huh@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>