[clang] [llvm] [DirectX] Removing dxbc StaticSampler from mcbxdc (PR #154631)

[Finn Plummer via llvm-commits]

https://github.com/inbelic approved this pull request.

LGTM, from the nit, we might want a clean-up pr that will move all these definitions to the `.cpp` file

https://github.com/llvm/llvm-project/pull/154631