Change in coreboot[master]: soc/intel/cannonlake: Disable UART_DEBUG by default

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/27205 )

Change subject: soc/intel/cannonlake: Disable UART_DEBUG by default
......................................................................

Patch Set 2:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/75225/ : SUCCESS