Change in coreboot[master]: mb/siemens/mc_apl1: Set up RTC backup mode to primary cell

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Change subject: mb/siemens/mc_apl1: Set up RTC backup mode to primary cell
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/56426/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/12017/ : SUCCESS