[M] Change in flashrom[main]: libflashrom: Update the API for progress callback

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Peter Marheine, Richard Hughes, Sergii Dmytruk.

Anastasia Klimchuk has posted comments on this change by Anastasia Klimchuk. ( https://review.coreboot.org/c/flashrom/+/86031?usp=email )

Change subject: libflashrom: Update the API for progress callback
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Patch Set 11:

(1 comment)

File include/flash.h:

https://review.coreboot.org/c/flashrom/+/86031/comment/dbdcab60_08d88acb?usp... :
PS8, Line 624: 	flashrom_progress_callback_v2 *progress_callback;
             : 	struct flashrom_progress progress_state;
             : 	struct stage_progress stage_progress[FLASHROM_PROGRESS_NR];
             : 	/* deprecated, do not use */
             : 	flashrom_progress_callback *deprecated_progress_callback;
             : 	struct flashrom_progress *deprecated_progress_state;
> I made an attempt (added lines 90-97 in libflashrom. […]

I rebased to fix merge conflict in devel.rst (my favourite type of merge conflict :D)

If you can have a look whether I addressed this comment or not? Thank you!