Change in coreboot[master]: soc/amd/stoneyridge: Wait for UART to be ready

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/21731 )

Change subject: soc/amd/stoneyridge: Wait for UART to be ready
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Patch Set 2: Verified-1

Build Failed

https://qa.coreboot.org/job/coreboot-gerrit/61336/ : ABORTED

https://qa.coreboot.org/job/coreboot-checkpatch/16479/ : SUCCESS