[coreboot-gerrit] Change in coreboot[master]: pcengines/apu1: align with apu{2, 3, 4, 5} lowe case naming

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Change subject: pcengines/apu1: align with apu{2,3,4,5} lowe case naming
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/73957/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/28070/ : SUCCESS