TOSA: Add support for Identity operation

Added support for Identity operation.

Signed-off-by: Patrik Gustavsson <patrik.gustavsson@arm.com>
Change-Id: If00b30528932f7531807ce3914d6c1875ab72fa4
diff --git a/ethosu/vela/graph_optimiser_util.py b/ethosu/vela/graph_optimiser_util.py
index d2d3d83..73fbf6c 100644
--- a/ethosu/vela/graph_optimiser_util.py
+++ b/ethosu/vela/graph_optimiser_util.py
@@ -35,6 +35,7 @@
     Op.QuantizedReshape,
     Op.Squeeze,
     Op.ExpandDims,
+    Op.Identity,
 )