Change in coreboot[master]: tests: Add lib/region_file-test test case

[Patrick Georgi (Code Review)]

Attention is currently required from: Martin Roth, [e-mail], Julius Werner, Jan Dabros.
Patrick Georgi has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49669 )

Change subject: tests: Add lib/region_file-test test case
......................................................................

Patch Set 4:

(1 comment)

File tests/include/tests/lib/region_file_data.h:

https://review.coreboot.org/c/coreboot/+/49669/comment/204f39a9_ab3fed55 
PS3, Line 9: void array_dump(void *array, size_t length)
> I agree with the statement that it looks slightly out of place, though I think it might be useful wh […]

with spinning out I meant moving it outside this file because it can be more generally useful (e.g. for other data files using this format)