[coreboot-gerrit] Change in coreboot[master]: driver/uart: Introduce a way for mainboard to override the baudrate

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Change subject: driver/uart: Introduce a way for mainboard to override the baudrate
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Patch Set 4: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/67713/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/22217/ : SUCCESS