[flashrom-gerrit] Change in flashrom[stable]: hwaccess: Constify `addr` argument of MMIO read functions

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Change subject: hwaccess: Constify `addr` argument of MMIO read functions
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Patch Set 1: Verified+1

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https://qa.coreboot.org/job/flashrom_gerrit/596/ : SUCCESS

https://qa.coreboot.org/job/flashrom-customrules/652/ : SUCCESS