I2S reconfiguration support

[bbutkovic]

I'm working on a project and I'd like to be able to reconfigure the I2S channels on-the-fly.

The IDF already has support for that so it would be great if we could also do it here.

I'm willing to work on this, in fact I started already, going to post a WIP PR.

[ivmarkov]

Can you describe a bit your specific use case, and in particular - why dropping and re-creating the driver would not work for your case?

[bbutkovic]

I'm writing a sort-of wrapper around the I2S driver that I may or may not publish later as a crate. I hold the driver within my struct wrapper, meaning when I want to drop and re-create the driver I have to also keep ties to the peripherals or pass them into the function that calls for re-configuration. This is all doable but by using the API above it would make it a little bit cleaner and easier to reason about.