[bazel] Add missing dep after #93008 (#93325)

This dep was removed in that change, but this library still needs it.

Author: keith

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

@@ -5662,6 +5662,7 @@ cc_library(
         ":Transforms",
         ":VCIXToLLVMIRTranslation",
         ":VectorDialect",
+        ":config",
         "//llvm:Core",
         "//llvm:MC",
         "//llvm:Support",