[flashrom-gerrit] Change in flashrom[staging]: Include <sys/types.h> wherever ssize_t is used

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Change subject: Include <sys/types.h> wherever ssize_t is used
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/flashrom-customrules/509/ : SUCCESS

https://qa.coreboot.org/job/flashrom_gerrit/469/ : SUCCESS