There was a pull request for a similar patch at https://github.com/flashrom/flashrom/pull/36. I pointed one of the commenters at the OpenEmbedded patch and they reported that the OE version of the patch works.
Also, I noticed that support for this chip series seems to have originated here: https://patchwork.coreboot.org/patch/4126/
I went ahead and uploaded the latest known (AFAICT) version here: https://review.coreboot.org/#/c/flashrom/+/25962/
Patch set 3:-Code-Review
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