[XS] Change in flashrom[main]: dummyflasher: Fix JEDEC_WRSR2 and JEDEC_WRSR3 emulation

[Sergii Dmytruk (Code Review)]

Attention is currently required from: Anastasia Klimchuk.

Sergii Dmytruk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/79390?usp=email )

Change subject: dummyflasher: Fix JEDEC_WRSR2 and JEDEC_WRSR3 emulation
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Patch Set 1: Code-Review-1

(1 comment)

Patchset:

PS1: 
Look, for example, at `spi_write_register()`:
```c
    	write_cmd[0] = JEDEC_WRSR;
    	write_cmd[1] = value;
// ...
    		write_cmd[0] = JEDEC_WRSR2;
    		write_cmd[1] = value;
// ...
    		write_cmd[0] = JEDEC_WRSR3;
    		write_cmd[1] = value;
```
Current code is correct.