[coreboot-gerrit] Change in coreboot[master]: nami: Add empty_ddr4.spd.hex for DDR4

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Change subject: nami: Add empty_ddr4.spd.hex for DDR4
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/19834/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/65083/ : SUCCESS