Change in coreboot[master]: mainboard/google/poppy: Decrease link-frequencies for OV13858 and OV5670

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Change subject: mainboard/google/poppy: Decrease link-frequencies for OV13858 and OV5670
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/57958/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/13401/ : SUCCESS