[M] Change in flashrom[main]: tests: Add test cases for erasing/writing unaligned layout regions

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Aarya, Alexander Goncharov, Peter Marheine.

Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/78985?usp=email )

Change subject: tests: Add test cases for erasing/writing unaligned layout regions
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Patch Set 4:

(2 comments)

Patchset:

PS4: 
I have modified test case #16 to heavily test extending the start of the unaligned region. Other test cases in this patch cover extending the end of unaligned region, and #19 has logical layout which is smaller than the total size of chip.

File tests/erase_func_algo.c:

https://review.coreboot.org/c/flashrom/+/78985/comment/abcb5b7a_f626eb52 :
PS2, Line 30: /* How many small chip test cases. */
> Drop the comment too. […]

Oh I completely missed! Done.