[coreboot-gerrit] Change in coreboot[master]: ifdtool: Const-correct and redesign some functions

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Change subject: ifdtool: Const-correct and redesign some functions
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Patch Set 41:

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/15661/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/60449/ : SUCCESS