[stm32n6, stm32h5, eth] Change eth driver to allow the MDIO clock div to be configurable

[AlexLanzano]

No description provided.

[Copilot]

Pull request overview

This PR makes the STM32H5 and STM32N6 Ethernet MDIO clock divider configurable by moving the MACMDIOAR CR selection from a driver-side constant into the per-board Ethernet configuration struct, so boards can select the correct divider for their HCLK.

Changes:

• Add mdioCr to whal_Stm32h5_Eth_Cfg and whal_Stm32n6_Eth_Cfg to carry the MACMDIOAR CR field value.
• Update STM32H5/STM32N6 MDIO read/write paths to use cfg->mdioCr instead of a hard-coded ETH_MDIO_CR.
• Update the STM32H563ZI Nucleo and STM32N657A0 Nucleo board ETH device initializers to set mdioCr appropriately for their HCLK.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
wolfHAL/eth/stm32n6_eth.h	Adds mdioCr to the STM32N6 ETH config struct (documented mapping for CR values).
wolfHAL/eth/stm32h5_eth.h	Adds mdioCr to the STM32H5 ETH config struct (documented mapping for CR values).
src/eth/stm32n6_eth.c	Uses cfg->mdioCr when programming MACMDIOAR for MDIO reads/writes.
src/eth/stm32h5_eth.c	Uses cfg->mdioCr when programming MACMDIOAR for MDIO reads/writes.
boards/stm32n657a0_nucleo/board.h	Sets .mdioCr in the STM32N6 ETH device config initializer.
boards/stm32h563zi_nucleo/board.h	Sets .mdioCr in the STM32H5 ETH device config initializer.

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