Change in coreboot[master]: mb/gigabyte/ga-{h61m-s2pv, b75m-d3h, b75m-d3v}: Clean up mainboard code

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Change subject: mb/gigabyte/ga-{h61m-s2pv,b75m-d3h,b75m-d3v}: Clean up mainboard code
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Patch Set 2: Verified-1

Build Unstable

https://qa.coreboot.org/job/coreboot-gerrit/75258/ : UNSTABLE

https://qa.coreboot.org/job/coreboot-checkpatch/29317/ : SUCCESS