[M] Change in flashrom[master]: ni845x_spi: refactor singleton states into reentrant pattern

[Miklós Márton (Code Review)]

Attention is currently required from: Anastasia Klimchuk, Alexander Goncharov.

Miklós Márton has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/72160 )

Change subject: ni845x_spi: refactor singleton states into reentrant pattern
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Patch Set 3:

(1 comment)

Patchset:

PS3:
> Miklos, could you please help to review and test this chain of patches? […]

I tried test it (managed to put togeter a Windows image with the proper mingw, etc.) however the make fails due to the lack of sphinx-build (even make flashrom too.). If possible I would avoid going down the rabbit hole to get sphinx-build on the platform. I saw others complaining about it on the mailing list: is the sphinx-build dependency intentional?