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/tflite/CustomOptionsFormat.py b/ethosu/vela/tflite/CustomOptionsFormat.py
index c2fc07c..bef384c 100644
--- a/ethosu/vela/tflite/CustomOptionsFormat.py
+++ b/ethosu/vela/tflite/CustomOptionsFormat.py
@@ -4,3 +4,4 @@
 
 class CustomOptionsFormat(object):
     FLEXBUFFERS = 0
+