Change in flashrom[master]: layout: Turn overlap debug message into warning

[Nico Huber (Code Review)]

Attention is currently required from: Thomas Heijligen, Anastasia Klimchuk.
Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/55999 )

Change subject: layout: Turn overlap debug message into warning
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Patch Set 1:

(1 comment)

File layout.c:

https://review.coreboot.org/c/flashrom/+/55999/comment/5d6f893b_23ec4ed8 
PS1, Line 269: warn
> It's certainly unexpected. The only place where this is currently called from treats this as an error.

That's it. And the only case when the warnings would be spurious would be
when the caller wanted to handle the overlapping somehow explicitly. But
then it would have to walk the layout again to find the details. Which
makes this function less useful for such a case, I guess.