Change in coreboot[master]: soc/intel/cannonlake: Usable dram top calculation based on HW registers

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Change subject: soc/intel/cannonlake: Usable dram top calculation based on HW registers
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Patch Set 1: Verified-1

Build Unstable

https://qa.coreboot.org/job/coreboot-gerrit/59400/ : UNSTABLE

https://qa.coreboot.org/job/coreboot-checkpatch/14709/ : SUCCESS