[coreboot-gerrit] Change in coreboot[master]: src/vendorcode/amd: Use AR variable in Makefiles

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Change subject: src/vendorcode/amd: Use AR variable in Makefiles
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Patch Set 2: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/61160/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/16325/ : SUCCESS