[L] Change in flashrom[master]: flashrom.c: Add wrapper function to use the erase algorithm

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Simon Buhrow, Nico Huber, Thomas Heijligen, Aarya.

Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/66104 )

Change subject: flashrom.c: Add wrapper function to use the erase algorithm
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Patch Set 67:

(1 comment)

File flashrom.c:

https://review.coreboot.org/c/flashrom/+/66104/comment/35545299_d3e76ed1 
PS67, Line 1151: flashctx->chip->read(flashctx, curcontents + region_start, region_start, old_start - region_start);
When I am running unit test CB:67535 it logs repeated invocations of reads with len==0 for all scenarios. I did quick debugging, it happens in this line when old_start == region_start.

It is probably harmless to invoke read with len==0, but I think better not to do it at all.