Change in coreboot[master]: arm64: Align cache maintenance code with libpayload and ARM32

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Change subject: arm64: Align cache maintenance code with libpayload and ARM32
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/9727/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/53990/ : SUCCESS