Remove AINT8

- Updated C and Py serialization libraries, updated licence files
- Removed AINT8 from TOSA reference tests

Signed-off-by: Kevin Cheng <kevin.cheng@arm.com>
Signed-off-by: Jared Smolens <jared.smolens@arm.com>
Change-Id: I860bfeaad5a075e50f569c8f6861927ebacf1378
diff --git a/serialization/tosa.fbs b/serialization/tosa.fbs
index 9df8746..e30c3cf 100644
--- a/serialization/tosa.fbs
+++ b/serialization/tosa.fbs
@@ -1,5 +1,5 @@
 
-// Copyright (c) 2020, ARM Limited.
+// Copyright (c) 2020-2021, ARM Limited.
 //
 //    Licensed under the Apache License, Version 2.0 (the "License");
 //    you may not use this file except in compliance with the License.
@@ -23,7 +23,6 @@
 enum DType:uint32 {
   UNKNOWN = 0,
   BOOL,
-  AINT8,
   UINT8,
   INT4,
   INT8,