Fix known SPI issues

[bugadani]

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Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
• I have used cargo xtask fmt-packages command to ensure that all changed code is formatted correctly.
• My changes were added to the CHANGELOG.md in the proper section.
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Pull Request Details 📖

Description

Changes include:

• Guarantee 4-byte alignment which is needed for some reason for PDMA
• Use is_done in wait to actually wait for the DMA to finish transferring from SPI to memory. This prevents weird test failures where an assert fails, then prints that the buffer and the expected value match.
• Clear interrupts after configuring DMA, which fixes the second call to dma_transfer
• Reintroduces a short wait for ESP32, which doesn't have an update bit so it starts transferring data before the DMA engine is ready.

Fixes #2098
Fixes #2186

Testing

yes

[bugadani]

Ah finally CI reproduces my local issues with ESP32. Fun!

[MabezDev]

LGTM, thanks!

[bugadani]

I solemnly wov that the ESP32 tests pass locally.

[jessebraham]

@bugadani Sounds good 😁 Changes LGTM, thanks!