MLBEDSW-2734: TensorFlow 2.3 compatibility

Compiled the new TensorFlow 2.3 schema and added the new Operator
BatchMatMul to tflite_mapping.py.

Signed-off-by: Jacob Bohlin <jacob.bohlin@arm.com>
Change-Id: Ie62517bd56a6497820e4f1ef20326a4fd2ca89b0
diff --git a/ethosu/vela/data_type.py b/ethosu/vela/data_type.py
index 4d05fef..a4b7b53 100644
--- a/ethosu/vela/data_type.py
+++ b/ethosu/vela/data_type.py
@@ -115,3 +115,4 @@
 DataType.resource = DataType(BaseType.Resource, 8)
 DataType.variant = DataType(BaseType.Variant, 8)
 DataType.complex64 = DataType(BaseType.Complex, 64)
+DataType.complex128 = DataType(BaseType.Complex, 128)