Merge branch 'dwmac-support-for-rockchip-rk3506'

Heiko Stuebner says:

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DWMAC support for Rockchip RK3506

Some cleanups to the DT binding for Rockchip variants of the dwmac
and adding the RK3506 support on top.

As well as the driver-glue needed for setting up the correct RMII
speed seitings.
====================

Link: https://patch.msgid.link/20251023111213.298860-1-heiko@sntech.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>