Change in coreboot[master]: drivers/uart: Use baudrate of 115200 by default

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Change subject: drivers/uart: Use baudrate of 115200 by default
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Patch Set 1: Verified-1

Build Failed

https://qa.coreboot.org/job/coreboot-gerrit/58086/ : FAILURE

https://qa.coreboot.org/job/coreboot-checkpatch/13519/ : SUCCESS