Change in coreboot[master]: payloads/SeaBIOS: Add different MMIO uart configurations

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Change subject: payloads/SeaBIOS: Add different MMIO uart configurations
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/18760/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/63896/ : SUCCESS