[llvm] [RISCV] Change RISCVMCExpr::VK_RISCV_None to RISCVMCExpr::VK_None (PR #131774)

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hchandel wrote:

Yeah, That's what I am also thinking about. #131489 which does this change landed before my PR #130779. CI checks should have caught this, but all those checks passed and I merged after approvals. Maybe my branch didn't have #131489 which somehow led to passing checks. I am not sure though. 

https://github.com/llvm/llvm-project/pull/131774