[mlir][Bazel] Add missing dependency.

Differential Revision: https://reviews.llvm.org/D121893

Author: akuegel

utils/bazel/llvm-project-overlay/mlir/BUILD.bazel

@@ -3012,6 +3012,7 @@ cc_library(
     ),
     deps = [
         ":Support",
+        "//llvm:Support",
     ],
 )