Change in coreboot[master]: mb/emu/*-riscv: Remove outdated memory map

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Change subject: mb/emu/*-riscv: Remove outdated memory map
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/60990/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/16169/ : SUCCESS