Change in flashrom[staging]: make args for -r/-w/-v non-positional and optional

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Change subject: make args for -r/-w/-v non-positional and optional
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Patch Set 3: Verified+1

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https://qa.coreboot.org/job/flashrom-customrules/243/ : SUCCESS

https://qa.coreboot.org/job/flashrom_gerrit/255/ : SUCCESS