revert decomp and disable forcing to insert ICast Layer

Author: zewenli98

py/torch_tensorrt/dynamo/conversion/aten_ops_converters.py

@@ -1093,7 +1093,7 @@ def aten_ops_clone_copy_dtype(
         name,
         args[0],
         kwargs.get("dtype", args[0].dtype),
-        force_layer=True,
+        force_layer=False,
     )
 
 

py/torch_tensorrt/dynamo/lowering/_decomposition_groups.py

@@ -105,7 +105,6 @@
     aten.norm,
     aten.ones,
     aten.ones_like,
-    aten._prelu_kernel,
     aten._prelu_kernel_backward,
     aten._reshape_alias,
     aten.rad2deg,