GSOC: GSOC2024_Yang_Adding SPI and Watchdog support to Raspberry Pi 4B BSP

[Ning Yang]

I've prepared a draft for my proposal. Please let me know how I could improve it. 
Thank you in advance. https://docs.google.com/document/d/1NjlUSWhqwUvrsQPBISU05ah0I0IGkEuq6BIThrkMBsg/edit
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