Change in coreboot[master]: arch/riscv: Remove supervisor_trap_entry

[build bot (Jenkins) (Code Review)]

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Change subject: arch/riscv: Remove supervisor_trap_entry
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Patch Set 2: Verified-1

Build Failed

https://qa.coreboot.org/job/coreboot-gerrit/63762/ : FAILURE

https://qa.coreboot.org/job/coreboot-checkpatch/18649/ : SUCCESS