Merge branch 'net-dsa-b53-fix-bcm63xx-rgmii-user-ports-with-speed-1g'

Merge branch 'net-dsa-b53-fix-bcm63xx-rgmii-user-ports-with-speed-1g'

Jonas Gorski says:

====================
net: dsa: b53: fix bcm63xx rgmii user ports with speed < 1g

It seems that the integrated switch in bcm63xx does not support polling
external PHYs for link configuration. While the appropriate registers
seem to exist with expected content, changing them does nothing.

This results in user ports with external PHYs only working in 1000/fd,
and not in other modes, despite linking up.

Fix this by writing the link result into the port state override
register, like we already do for fixed links.

With this, ports with lower speeds can successfully transmit and receive
packets.

This also aligns the behaviour with the old bcm63xx_enetsw driver for
those ports.
====================

Link: https://patch.msgid.link/20251101132807.50419-1-jonas.gorski@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>