Change in coreboot[master]: amd/stoneyridge: Use generic fixed MTRR setup

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Change subject: amd/stoneyridge: Use generic fixed MTRR setup
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Patch Set 2:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/67628/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/22137/ : SUCCESS