Change in flashrom[master]: ni845x_spi: add missing const specifier to the spi_transmit function

[Angel Pons (Code Review)]

Attention is currently required from: Nico Huber, Miklós Márton, Edward O'Callaghan, Anastasia Klimchuk.
Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/57003 )

Change subject: ni845x_spi: add missing const specifier to the spi_transmit function
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Patch Set 1:

(1 comment)

Patchset:

PS1:
> Many thanks for the quick review!
>
> Well the internal API seems to be changed since the ni845x_spi introduction and I have not built flashrom on Windows since then. As we discussed before it might be useful to create a mock C file for the ni845x.h library header to being able to perfrom least compilation tests (without Windows, mingw, and installed NI drivers). I actually started to work on this yesterday.

Speaking of mocks, this gives me an idea: how about making something that not only serves to build-test the code, but also allows running cmocka tests on ni845x?