utils: tuning: Change Tuner.add() to accept a list of modules

Change the first parameter of Tuner.add() to accept either a list of
modules or a single module. This allows more compact code and is in sync
with Tuner.set_output_order().

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

utils/tuning/libtuning/libtuning.py

@@ -95,7 +95,10 @@ class Tuner(object):
         self.output = {}
 
     def add(self, module):
-        self.modules.append(module)
+        if isinstance(module, list):
+            self.modules.extend(module)
+        else:
+            self.modules.append(module)
 
     def set_input_parser(self, parser):
         self.parser = parser