Add <zephyr/fff.h> from zephyr v3.1.0 (#406)
Zephyr is deprecating the zmock library in favor of using the FFF faking library for defining and controlling fake implementations of depended-upon APIs called by the code-under-test. Signed-off-by: Gregory Shue <gregory.shue@legrand.com> Co-authored-by: Gregory Shue <gregory.shue@legrand.com>
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