[clang] [RISCV][Clang] Add RequiredFeatures to zvfh intrinsics (PR #115436)

[Brandon Wu via cfe-commits]

https://github.com/4vtomat approved this pull request.

Somehow I missed [this](https://github.com/llvm/llvm-project/issues/94306) issue, thanks for fixing this!

https://github.com/llvm/llvm-project/pull/115436