The VSC8584 (and most likely other PHYs in the same generation) has two
additional LED modes that can be picked, so let's add them.
Reviewed-by: Rob Herring <firstname.lastname@example.org>
Reviewed-by: Florian Fainelli <email@example.com>
Reviewed-by: Andrew Lunn <firstname.lastname@example.org>
Signed-off-by: Quentin Schulz <email@example.com>
Signed-off-by: David S. Miller <firstname.lastname@example.org>