[coreboot-gerrit] Change in coreboot[master]: Consolidate reset API, add generic reset_prepare mechanism

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Change subject: Consolidate reset API, add generic reset_prepare mechanism
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Patch Set 4: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/10172/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/54450/ : SUCCESS