net: phy: micrel: Cable Diag feature for lan8814 phy

Support for Cable Diagnostics in lan8814 phy

Signed-off-by: Divya Koppera <Divya.Koppera@microchip.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20220909083123.30134-1-Divya.Koppera@microchip.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>