Change in coreboot[master]: soc/intel/apollolake: Use common/block/uart code

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Change subject: soc/intel/apollolake: Use common/block/uart code
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Patch Set 3:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/53076/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/8912/ : SUCCESS