Remove import HeteroPlanner to fix torch package issues

Differential Revision: D56358725

torchrec/distributed/planner/__init__.py

@@ -21,9 +21,6 @@
     - automatically building and selecting an optimized sharding plan.
 """
 
-from torchrec.distributed.planner.planners import (  # noqa
-    EmbeddingShardingPlanner,
-    HeteroEmbeddingShardingPlanner,  # noqa
-)
+from torchrec.distributed.planner.planners import EmbeddingShardingPlanner  # noqa
 from torchrec.distributed.planner.types import ParameterConstraints, Topology  # noqa
 from torchrec.distributed.planner.utils import bytes_to_gb, sharder_name  # noqa