devlib.target: Fix AndroidTarget unpickle

Fix __setstate__ to call super().__setstate__ in order to handle the
generic part of the deserialization.

Author: douglas-raillard-arm

devlib/target.py

@@ -1798,7 +1798,7 @@ def __getstate__(self):
         }
 
     def __setstate__(self, dct):
-        self.__dict__.update(dct)
+        super().__setstate__(dct)
         self._init_logcat_lock()
 
     @asyn.asyncf