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/Padding.py b/ethosu/vela/tflite/Padding.py
index 168bf74..6027f4b 100644
--- a/ethosu/vela/tflite/Padding.py
+++ b/ethosu/vela/tflite/Padding.py
@@ -5,3 +5,4 @@
 class Padding(object):
     SAME = 0
     VALID = 1
+