MLBEDSW-5410 Clarify "Subgraph IO Summary" output

* Add small aesthetic changes to summary
* Move "_cpu" suffix from cloned tensor to original tensor such that suffix is no longer externally visible

Signed-off-by: James Ward <james.ward@arm.com>
Change-Id: I97427561bd9acb04765ae9de6278760511278118
diff --git a/ethosu/vela/extract_npu_subgraphs.py b/ethosu/vela/extract_npu_subgraphs.py
index b536cfb..d802b51 100644
--- a/ethosu/vela/extract_npu_subgraphs.py
+++ b/ethosu/vela/extract_npu_subgraphs.py
@@ -104,7 +104,8 @@
     orig_tens, call_ps, startup_init_ps, npu_subgraph, cpu_subgraph, subgraph_for_pass
 ):
 
-    new_tens = orig_tens.clone("_cpu")
+    new_tens = orig_tens.clone("")
+    orig_tens.name = orig_tens.name + "_cpu"
     npu_subgraph.output_tensors.append(orig_tens)
 
     call_ps.outputs.append(new_tens)