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

[via llvm-commits]

hchandel wrote:

> If either of the windows or linux build has already passed, a fixup like this should be good to go.

I didn't know that. Thanks for the clarification. 

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