adc support for STM32H5

[hajue-schmitz]

Does it make sense to extend the existing STM32 ADC drivers to support the STM32H5 series, or is it better to create a new one? The register definitions differ significantly in some areas.

[salkinium]

Add a new one, it gets messy real quick. You also can specialize the API a little more towards the hardware, there's so much difference between the families, the shared API is basically too simple to be useful.