USB HS support fixes on STM32U5

[erikarn]

this is a WIP (i haven't even checkpatched it!) to address Issues #79823 and Issue #79825

[github-actions]

Hello @erikarn, and thank you very much for your first pull request to the Zephyr project!
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[jfischer-no]

Can you please familiarize yourself with how to write commit titles and messages, and the PR submission process? Read the link posted by the bot above. Use git log to get an idea of how to write commit messages.

[erikarn]

Can you please familiarize yourself with how to write commit titles and messages, and the PR submission process? Read the link posted by the bot above. Use git log to get an idea of how to write commit messages.

oh absolutely, I'm slowly massaging this into the right shape. I just wanted to first make sure I got the code somewhere in case I got busy!

[kartben]

Can you please familiarize yourself with how to write commit titles and messages, and the PR submission process? Read the link posted by the bot above. Use git log to get an idea of how to write commit messages.

oh absolutely, I'm slowly massaging this into the right shape. I just wanted to first make sure I got the code somewhere in case I got busy!

You might want to set the PR as draft in the meantime so that reviewers know it's not ready for review just yet (but you might still get early feedback and, to your point, this would have the merit of putting the code somewhere :))

[erikarn]

Ok! Lemme go find how to mark it as draft, I've not done that before! heh