Change in coreboot[master]: mediatek: Share PLL code among similar SOCs

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Change subject: mediatek: Share PLL code among similar SOCs
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Patch Set 4: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/75662/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/29716/ : SUCCESS