[llvm] [RISCV]Enable framework to resolve encoding conflicts among vendor-specific CSRs (PR #97287)

[Garvit Gupta via llvm-commits]

quic-garvgupt wrote:

@topperc, can we merge this PR as well? This depends on PR#96174 which is already merged now.

https://github.com/llvm/llvm-project/pull/97287