ESP32-S2: Add SPI Slave support

[JurajSadel]

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Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
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Pull Request Details 📖

Description

Adds SPI Slave for ESP32S2 and removes ESP32 parts from it.

Testing

Tested with spi_slave_dma example.

Builds on top of #1514 but removed all ESP32-related changes from the driver. After discussion with @bjoernQ, we agreed it makes sense to add just S2 and remove ESP32 parts, we've burnt so much time on that and the thing doesn't work.

[MabezDev]

Given that the example is almost a test, could we add some test cases? I think we will need some hardware changes as we'll need more pins wired up.

[SergioGasquez]

Given that the example is almost a test, could we add some test cases? I think we will need some hardware changes as we'll need more pins wired up.

This will be fun. See #1332 (comment) to have some reference when choosing the new pins so we can avoid having too many cfgs arround

[MabezDev]

This will be fun. See #1332 (comment) to have some reference when choosing the new pins so we can avoid having too many cfgs arround

Maybe we can do this in another PR if it will be a pain, but it seems like something we can test in the future at least which would be nice!

[JurajSadel]

This will be fun. See #1332 (comment) to have some reference when choosing the new pins so we can avoid having too many cfgs arround

Maybe we can do this in another PR if it will be a pain, but it seems like something we can test in the future at least which would be nice!

Let's add this in another PR, Tomas is on leave this week and we need to buy cables as well, in a meantime I can try to figure out the pins.

[MabezDev]

Thanks!

[bjoernQ]

LGTM - Thanks