Update itsybitsy_m0 and itsybitsy_m4 to HAL 0.17

[ianrrees]

Summary

Quite a few small updates

I'm a bit unsettled about the HAL prelude. Using it winds up bringing in multiple traits which apparently require ugly disambiguation, it seems like this should be cleaner:

InterruptDrivenTimer::start(&mut timer, Hertz::MHz(4).into_duration());

Checklist

• CHANGELOG.md for the BSP or HAL updated
• All new or modified code is well documented, especially public items
• No new warnings or clippy suggestions have been introduced - CI will deny clippy warnings by default! You may #[allow] certain lints where reasonable, but ideally justify those with a short comment.

[jbeaurivage]

That should probably be a separate discussion, but I'm not a fan of the prelude in the first place. I'm happy to merge though if you think this is ready!