Merge branch 'net-mdio-realtek-rtl9300-add-rtl931x-support'

Markus Stockhausen says:

====================
net: mdio: realtek-rtl9300: Add RTL931x support

The Realtek Otto switch platform consists of four different series

- RTL838x aka maple   : 28 port 1G Switches
- RTL839x aka cypress : 52 port 1G Switches
- RTL930x aka longan  : 28 port 1G/2.5G/10G Switches
- RTL931x aka mango   : 56 port 1G/2.5G/10G Switches

This patch series adds support for the RTL931x devices. For this

- Enhance device tree binding.
- Implement final cleanups and enhancments for the driver.
- Add RTL931x coding.

Remark: Instead of this series it was planned to bring support for
hardware polling configuration first. It turns out that more testing
is needed - especially for the RTL83xx SoCs. Instead add the lineup
of the RTL931x devices, that are known to have no obvious bus and
polling issues (at least from testing and vendor SDK perspective).
====================

Link: https://patch.msgid.link/20260610194145.4153668-1-markus.stockhausen@gmx.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>