[llvm] [mlir] [MLIR][Python] remove nb::typed to fix bazel build (PR #160183)

[Maksim Levental via llvm-commits]

makslevental wrote:

> What's happening is the types passed to the second parameter aren't the correct types now, with or without this commit cherry-picked. Was there any functional change to `FunctionType.get`?

I'm guessing that `_Value._from_cmlir(arg).type` returns a `MlirType`? In which case the issue is there's no initer for `PyType` from `MlirType`.

https://github.com/llvm/llvm-project/pull/160183