Change in coreboot[master]: mainboards/hp: Add HP Elitebook 8470p

[build bot (Jenkins) (Code Review)]

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Change subject: mainboards/hp: Add HP Elitebook 8470p
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Patch Set 7: Verified-1

Build Unstable

https://qa.coreboot.org/job/coreboot-gerrit/56599/ : UNSTABLE

https://qa.coreboot.org/job/coreboot-checkpatch/12173/ : SUCCESS