MLBEDSW-3774 Removed ConcatSliceWrite

-Removed ConcatSliceWrite from the optimised graph.
 Always executed as avgpool, which is equivalent with
 before the patch.

-Added copy op to enable more removal of reshapes.
 Sg input/outputs need to remain. When Reshape input and
 outut, are sg input/outputs a copy op is needed to
 be inserted, in order to remove the reshape.

Signed-off-by: Patrik Gustavsson <patrik.gustavsson@arm.com>
Change-Id: Id7be9966673ae34499e8518a5544104493fe326b
diff --git a/ethosu/vela/pass_packing.py b/ethosu/vela/pass_packing.py
index abd235f..b52b159 100644
--- a/ethosu/vela/pass_packing.py
+++ b/ethosu/vela/pass_packing.py
@@ -81,7 +81,7 @@
 
 npu_post_fuse_limited_ops = set(
     # Set of post operators that should not be fused with main/elementwise ops
-    (Op.ConcatSliceWrite, Op.Sigmoid, Op.Tanh, Op.Quantize)
+    (Op.Sigmoid, Op.Tanh, Op.Quantize)
 )
 
 elem_wise_ops = elem_wise_main_ops | activation_ops | set((Op.Sigmoid, Op.Tanh))