tests: Start port-i/o mocking framework

This will be used to mock the i/o needs of indvidiual programmer
drivers. For each programmer driver, a `struct io_mock` can be
registered to dispatch inb()/outb() and friends.

Change-Id: I8df02832deba80761b57435244a29d0d9b4e2649
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/52794
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
1 file changed