Change in flashrom[staging]: linux_spi: Dynamically detect max buffer size

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Change subject: linux_spi: Dynamically detect max buffer size
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/flashrom_gerrit/723/ : SUCCESS

https://qa.coreboot.org/job/flashrom-customrules/824/ : SUCCESS