Change in flashrom[staging]: Add a generic 27C256 definition (32k UV EPROM)

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Change subject: Add a generic 27C256 definition (32k UV EPROM)
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/flashrom-customrules/300/ : SUCCESS

https://qa.coreboot.org/job/flashrom_gerrit/305/ : SUCCESS