Fix for for python >= 3.11

Until python 3.11 IntEnum.srt() returned "<Enum name>.<member name>"
But since then it returns the string of its numeric value instead.
This causes errors like:
  File "edtt/src/components/attdata.py", line 374, in __str__
    result = self.__opcodeName( opcode );
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "edtt/src/components/attdata.py", line 349, in __opcodeName
    result = result.split('.')[1];
             ~~~~~~~~~~~~~~~~~^^^

Let's pick the "name" instead which is directly the Enum member name.
This works both with newer and older python versions since enum was
added in version 3.4.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

Author: aescolar

src/components/attdata.py

@@ -339,14 +339,12 @@ def decode(self, data):
         return result;
 
     def __errorText(self, error):
-        result = str(ATTError( error ));
-        result = result.split('.')[1];
+        result = ATTError(error).name;
         result = '_'.join([_.lower().capitalize() if _ != 'ATT' else _ for _ in result.split('_')]);
         return result;
 
     def __opcodeName(self, opcode):
-        result = str(ATTOpcode( opcode ));
-        result = result.split('.')[1];
+        result = ATTOpcode(opcode).name;
         result = '_'.join([_.lower().capitalize() if _ != 'ATT' else _ for _ in result.split('_')]);
         return result;