[S] Change in flashrom[main]: flashchips.c: Add support for XM25RU256C

[Georg Gottleuber (Code Review)]

Attention is currently required from: Anastasia Klimchuk, Nikolai Artemiev, Stefan Reinauer.

Georg Gottleuber has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/82101?usp=email )

Change subject: flashchips.c: Add support for XM25RU256C
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Patch Set 2:

(3 comments)

Patchset:

PS1:
> Thank you! Do you have a link to the datasheet for the chip?

I have personally asked for the datasheet, but I don't know if it is okay to publish it. XM25RU256C is very similar to XM25QU256C.

Patchset:

PS2: 
Thank you for the quick review.

File flashchips.c:

https://review.coreboot.org/c/flashrom/+/82101/comment/82916e6e_ac7f0dcf :
PS1, Line 21731: TEST_UNTESTED
> You tested it, from the logs your provided you did probe, read, write, so this should be `TEST_OK_PR […]

OK, I was unsure how this review process works and didn't want to force two steps at once. See patchset v2...