Change in coreboot[master]: [HACK] arch/riscv: build the code without RVC

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Change subject: [HACK] arch/riscv: build the code without RVC
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/61082/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/16251/ : SUCCESS