[llvm] [mlir] CMake: Remove unnecessary dependencies on LLVM/MLIR (PR #110362)

[Mehdi Amini via llvm-commits]

joker-eph wrote:

I reverted because of the breakage, but these breakages should provide source of informations about the issues to fix. Please cherry-pick this at HEAD and reopen a new PR with the fixes.

Seeing that `mlir-nvidia` is broken, I suspect that trying to build locally with `-DLLVM_BUILD_SHARED=ON` should surface a lot of these issues.

https://github.com/llvm/llvm-project/pull/110362