Change in coreboot[master]: inteltool: add hint for the compiler to avoid fall through warning

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Change subject: inteltool: add hint for the compiler to avoid fall through warning
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/18651/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/63764/ : SUCCESS