Change in flashrom[master]: tests: Move current_io to io_mock.c be visible across tests

[Anastasia Klimchuk (Code Review)]

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

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

https://review.coreboot.org/c/flashrom/+/57915

to look at the new patch set (#4).

Change subject: tests: Move current_io to io_mock.c be visible across tests
......................................................................

tests: Move current_io to io_mock.c be visible across tests

tests.c is growing and needs to be split, specifically all
libusb wraps need to be extracted into their own file. See later
in the chain a lot more wraps are added for libusb functions. To
be able to split it, current_io needs to be moved one level up,
to be visible across tests. This allows having multiple files with
wraps, and all the wraps can use current_io.

BUG=b:181803212
TEST=builds and ninja test

Change-Id: I5327b5de430afe13a8cc931c8b4b188dcb8c8cf6
Signed-off-by: Anastasia Klimchuk 
---
A tests/io_mock.c
M tests/io_mock.h
M tests/meson.build
M tests/tests.c
4 files changed, 66 insertions(+), 41 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/15/57915/4