Change in coreboot[master]: mainboard/hp: Add HP Elitebook 8770w

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Change subject: mainboard/hp: Add HP Elitebook 8770w
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Patch Set 1: Verified-1

Build Unstable

https://qa.coreboot.org/job/coreboot-gerrit/67113/ : UNSTABLE

https://qa.coreboot.org/job/coreboot-checkpatch/21677/ : SUCCESS