Change in coreboot[master]: soc/intel/{apl, glk}: Move flush_l1d_to_l2 function to common location

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Change subject: soc/intel/{apl,glk}: Move flush_l1d_to_l2 function to common location
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/69640/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/23949/ : SUCCESS