[S] Change in flashrom[master]: flashchips.c: Add 4BA write to XM25Qx256C

[Liam Flaherty (Code Review)]

Attention is currently required from: Felix Singer, Angel Pons.

Liam Flaherty has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/69713 )

Change subject: flashchips.c: Add 4BA write to XM25Qx256C
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Patch Set 3:

(2 comments)

Commit Message:

https://review.coreboot.org/c/flashrom/+/69713/comment/0038e93c_307f9f3d 
PS2, Line 10: command (0x12) according to their datasheets, but the feature flag is not enabled in flashchips.c, so enable it to allow this feature to be used.
> Wrap at 72 chars

Done

https://review.coreboot.org/c/flashrom/+/69713/comment/3e1d52c5_d2df714e 
PS2, Line 11:
> Tested?

I don't have access to these chips, so I have left the `tested` field as `TEST_UNTESTED`. This change is based on what the datasheet claims.