Change in coreboot[master]: mainboard/hp: Add Elitebook Folio 9470m

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Change subject: mainboard/hp: Add Elitebook Folio 9470m
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Patch Set 6:

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/23335/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/68976/ : SUCCESS