[coreboot-gerrit] Change in coreboot[master]: pcengines/apu2: add support for apu4 variant

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Change subject: pcengines/apu2: add support for apu4 variant
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Patch Set 3: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/19651/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/64876/ : SUCCESS