Add SGMII access read and write functions
Add support to SGMII 1G and 2.5G for PCI11010/PCI11414 chips
Signed-off-by: NRaju Lakkaraju <Raju.Lakkaraju@microchip.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>