net: macb: fix SGMII with inband aneg disabled

net: macb: fix SGMII with inband aneg disabled

Make it possible to connect a PHY which does not use inband
autoneg to a gem MAC using phylink's information.

The previous implementation relied on whether or not the link
was a fixed-link to disable SGMII autoneg. This commit extend
this to all link which are not configured for inband
autonegotiation.

Signed-off-by: Charles Perry <charles.perry@microchip.com>
Link: https://patch.msgid.link/20260224202854.112813-2-charles.perry@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>