Fix bazel build issue I introduced in #166918 (#166921)

Author: basioli-k

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

@@ -1638,9 +1638,9 @@ gentbl_filegroup(
         "-bind-dialect=transform",
         "-dialect-extension=xegpu_transform",
     ]},
-    tblgen = "//third_party/llvm/llvm-project/mlir:mlir-tblgen",
+    tblgen = "//mlir:mlir-tblgen",
     td_file = "mlir/dialects/XeGPUTransformOps.td",
     deps = [
-        "//third_party/llvm/llvm-project/mlir:XeGPUTransformOpsTdFiles",
+        "//mlir:XeGPUTransformOpsTdFiles",
     ],
 )