Split import/export between TF Graph/SavedModel and MLIR TF dialect (NFC)

This allows cases that only intends to export (or import) the graph to reduce their
dependency (and final binary size potentially).
Also cleanup some dependencies in tensorflow/compiler/mlir/tensorflow/BUILD.

PiperOrigin-RevId: 414661640
diff --git a/integrations/tensorflow/iree_tf_compiler/BUILD b/integrations/tensorflow/iree_tf_compiler/BUILD
index 78741c7..66b316c 100644
--- a/integrations/tensorflow/iree_tf_compiler/BUILD
+++ b/integrations/tensorflow/iree_tf_compiler/BUILD
@@ -88,7 +88,7 @@
         "@org_tensorflow//tensorflow/cc/saved_model:loader",
         "@org_tensorflow//tensorflow/compiler/mlir:init_mlir",
         "@org_tensorflow//tensorflow/compiler/mlir/tensorflow",
-        "@org_tensorflow//tensorflow/compiler/mlir/tensorflow:convert_graphdef",
+        "@org_tensorflow//tensorflow/compiler/mlir/tensorflow:import_model",
         "@org_tensorflow//tensorflow/compiler/mlir/tensorflow:tf_dialect_passes",
         "@org_tensorflow//tensorflow/core/platform:errors",
     ],