[coreboot-gerrit] Change in coreboot[master]: ifdtool: optimize some code and data types

[build bot (Jenkins) (Code Review)]

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Change subject: ifdtool: optimize some code and data types
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Patch Set 32:

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/15421/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/60194/ : SUCCESS