Merge branch 'side-mdio-support-for-lan937x-switches'

Oleksij Rempel says:

====================
Side MDIO Support for LAN937x Switches

This patch set introduces support for an internal MDIO bus in LAN937x
switches, enabling the use of a side MDIO channel for PHY management
while keeping SPI as the main interface for switch configuration.

other changelogs are added to separate patches.
====================

Link: https://patch.msgid.link/20241106075942.1636998-1-o.rempel@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>