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/reference_model/src/quant_util.h b/reference_model/src/quant_util.h
index f9ac501..1784493 100644
--- a/reference_model/src/quant_util.h
+++ b/reference_model/src/quant_util.h
@@ -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.
@@ -68,22 +68,13 @@
 public:
     static bool is_integer(DType dtype)
     {
-        if (dtype == DType_INT4 || dtype == DType_INT8 || dtype == DType_AINT8 || dtype == DType_UINT8 ||
+        if (dtype == DType_INT4 || dtype == DType_INT8 || dtype == DType_UINT8 ||
             dtype == DType_INT16 || dtype == DType_INT32 || dtype == DType_INT48)
         {
             return true;
         }
         return false;
     }
-    static bool is_symmetric(DType dtype)
-    {
-        if (dtype == DType_INT4 || dtype == DType_INT8 || dtype == DType_INT16 || dtype == DType_INT32 ||
-            dtype == DType_INT48)
-        {
-            return true;
-        }
-        return false;
-    }
 };
 };    // namespace TosaReference