drivers: eth: fix stm32_hal PHY address resolution

[scaprile]

Fixes: #77705

Fix wrong macro.
Tested with all the boards mentioned in that issue, build now works.

[github-actions]

Hello @scaprile, and thank you very much for your first pull request to the Zephyr project!
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[AlexFabre]

This wrong macro call is my mistake, sorry for that.

[pdgendt]

Please rebase as the CI issue has been fixed in main.

[erwango]

@scaprile Please remove the merge commit.

[scaprile]

@scaprile Please remove the merge commit.

@erwango Github closed this commit when I force pushed on my fork... (?) can you reopen ? (I can't)

[pdgendt]

There are no commits on your main branch anymore.

[scaprile]

Yeah, I must have screwed something and blamed Github... added on top
Thanks.

[github-actions]

Hi @scaprile!
Congratulations on getting your very first Zephyr pull request merged 🎉🥳. This is a fantastic achievement, and we're thrilled to have you as part of our community!

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