Change in coreboot[master]: soc/intel/cannonlake: Add proper support to enable UART2 in 16550 mode

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Change subject: soc/intel/cannonlake: Add proper support to enable UART2 in 16550 mode
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Patch Set 3:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/58432/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/13839/ : SUCCESS