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

[Anastasia Klimchuk (Code Review)]

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

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

Patch Set 9: Code-Review+2

(1 comment)

File flash.h:

https://review.coreboot.org/c/flashrom/+/60230/comment/36fdd93b_659c6cc9 
PS2, Line 148: FEATURE_SR3
Thank for explaining, I understand why there is one flag.
> Single flag or no flag at all?

Single flag, I am thinking: the code would look consistent with SR2 code (as Sergii mentioned). The cases in spi_write_register and spi_read_register would look similar between status2 and 3, I think it's good?
What do you think Nico? (since you asked about no flag at all?)