[flashrom-gerrit] Change in flashrom[master]: spi25_statusreg.c: add SR3 read/write support

[Sergii Dmytruk (Code Review)]

Attention is currently required from: Nico Huber, Anastasia Klimchuk, Nikolai Artemiev.
Sergii Dmytruk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/60230 )

Change subject: spi25_statusreg.c: add SR3 read/write support
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Patch Set 4:

(1 comment)

File flash.h:

https://review.coreboot.org/c/flashrom/+/60230/comment/6b088dd4_818f7e8e 
PS2, Line 148: FEATURE_SR3
> Single flag or no flag at all? What information does it carry that wouldn't be […]

It just communicates availability of SR3 since not all chips have it. I mostly followed code that adds SR2 though and can drop this flag if you think it's not actually necessary to guard against accidental use of opcodes that might not be supported.