Change in coreboot[master]: soc/intel/skylake: Make use of Intel common Graphics block

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Change subject: soc/intel/skylake: Make use of Intel common Graphics block
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Patch Set 3: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/64016/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/18865/ : SUCCESS