[coreboot-gerrit] Change in coreboot[master]: include/device: Split i2c.h into three

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Change subject: include/device: Split i2c.h into three
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Patch Set 4: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/58578/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/13969/ : SUCCESS