The Silicon Errata and Data Sheet Clarification documents for the
KSZ9477 series of chips describe a number of otherwise undocumented PHY
register settings which are required to work around various chip errata.
Apply these settings when initializing the PHY ports on these chips.
Signed-off-by: NRobert Hancock <hancock@sedsystems.ca>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>