Change in coreboot[master]: mediatek: Move uart, timer and cbmem code to a common directory.

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Change subject: mediatek: Move uart, timer and cbmem code to a common directory.
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Patch Set 11: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/74374/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/28492/ : SUCCESS