add small tweak to fix issue 1054

Author: JanFSchulte

hls4ml/model/optimizer/passes/convert_to_channels_last.py

@@ -94,7 +94,11 @@ def transform(self, model, node):
                 node.add_output_variable(shape, dims)
 
             # Have to transpose back before flattening to get correct order of elements in the flattened tensor
-            if isinstance(node, Reshape) and len(node.attributes['target_shape']) == 1:
+            if (
+                isinstance(node, Reshape)
+                and len(node.attributes['target_shape']) == 1
+                and not model.config.config['HLSConfig']['Model']['ChannelsLastConversion'] == "internal"
+            ):
                 previous_node = node.get_input_node(node.inputs[0])
                 input = previous_node.name
                 outshape = previous_node.get_output_variable().shape