Reverse-engineered CH347 SPI protocol

[981213]

WCH doesn't remove the private structures from their Linux library which makes reverse-engineering really easy.

I've done the reverse-engineering of SPI protocol and made a SPI-NOR flash programmer using it:
https://github.com/981213/ch347-nor-prog

The ch347.c/.h is my implementation of the SPI protocol and it may be interesting for you :)

[qianfan-Zhao]

this is a flashrom portting which make ch347t supported.
https://github.com/qianfan-Zhao/flashrom/blob/ch347/ch347t_spi.c

@nic3-14159 @981213 Thanks for yours work.