Change in flashrom[master]: tests: add init_shutdown test for realtek_mst_i2c_spi

[Peter Marheine (Code Review)]

Attention is currently required from: Nico Huber, Edward O'Callaghan, Angel Pons, Peter Marheine.
Hello build bot (Jenkins), Nico Huber, Edward O'Callaghan, Angel Pons, Anastasia Klimchuk,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/flashrom/+/56911

to look at the new patch set (#5).

Change subject: tests: add init_shutdown test for realtek_mst_i2c_spi
......................................................................

tests: add init_shutdown test for realtek_mst_i2c_spi

This can catch regressions like the earlier one in this programmer that
caused initialization to always fail. Requires support for mocking POSIX
file I/O functions because the programmer does ioctls on the opened
file.

TEST=ninja test

Signed-off-by: Peter Marheine 
Change-Id: I5a5c617d1ec35d2a3bbe622e5add82a65eb396f0
---
M tests/init_shutdown.c
M tests/io_mock.h
M tests/meson.build
M tests/tests.c
M tests/tests.h
5 files changed, 108 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/11/56911/5