[M] Change in flashrom[main]: Fix FEATURE_NO_ERASE chips and add test for them

[Peter Marheine (Code Review)]

Attention is currently required from: Anastasia Klimchuk, Miklós Márton.

Peter Marheine has posted comments on this change by Anastasia Klimchuk. ( https://review.coreboot.org/c/flashrom/+/84203?usp=email )

Change subject: Fix FEATURE_NO_ERASE chips and add test for them
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Patch Set 5:

(1 comment)

File include/flash.h:

https://review.coreboot.org/c/flashrom/+/84203/comment/3e988205_64795c4a?usp... :
PS5, Line 152:  * Feature indicates that the chip does not require erase before writing.
             :  * For implementation details, see spi95.c and search for M95M02 definition in flashchips.c.
That's reasonable, but I think we can spend a few more words to include much of the explanation we've done here to minimize possible confusion. Pointing to a specific part of the code also seems error-prone (if it were to change), and this flag doesn't get used much so providing more general information seems fine: users can easily search the code for uses of this flag to find the implementation.

```suggestion
 * Feature indicates that the chip does not require erase before writing:
 * write operations can set any bit to any value without first doing an erase,
 * but bulk erase operations may still be supported.
 *
 * EEPROMs usually behave this way (compare to Flash, which requires erase),
 * for example the ST M95M02.
```