Change in coreboot[master]: drivers/mrc_cache: only add mrc.cache when CACHE_MRC_SETTINGS is set

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Change subject: drivers/mrc_cache: only add mrc.cache when CACHE_MRC_SETTINGS is set
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Patch Set 4: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/19575/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/64798/ : SUCCESS