implement a parallel interface for esp32 using the i2s peripheral

[liebman]

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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

The ESP32 supports a "LCD" interface on the i2s peripheral. This PR implements that for TX. Note that there are some limitations on the byte/word order that I don't believe can be corrected with peripheral configuration:

• 8bit: [0, 1, 2, 3] is output as [2, 3, 0, 1]
• 16bit: [0, 1, 2, 3] is output as [1, 0, 3, 2]

Testing

• Logic analyzer
• HUB75 Display

[liebman]

Not sure why the i2s HIL test is failing - I made no changes there.

[Dominaezzz]

Not sure why the i2s HIL test is failing - I made no changes there.

They've always been flakey.

[bjoernQ]

Thanks - I was only able to test this with a logic-analyzer but that looked good

[bugadani]

I'm hoping we can get away with minimal changes for the S2 - the TRM seems to mention LCD there as well. Thank you!