[mlir][linalg][nfc] Clean-up leftover code post #149156#151325

banach-space wants to merge 1 commit intollvm:mainllvm/llvm-project:mainfrom

banach-space:users/banach-space/remove-dead-codebanach-space/llvm-project:users/banach-space/remove-dead-codeCopy head branch name to clipboard