Delete redundant code

it's already in the PlugMMEU01 class which PlugMAEU01 extends

zhaquirks/xiaomi/aqara/plug_eu.py

@@ -144,13 +144,6 @@ async def bind(self):
 class PlugMAEU01(PlugMMEU01):
     """lumi.plug.maeu01 plug."""
 
-    def __init__(self, *args, **kwargs):
-        """Init."""
-        self.voltage_bus = Bus()
-        self.consumption_bus = Bus()
-        self.power_bus = Bus()
-        super().__init__(*args, **kwargs)
-
     signature = {
         MODELS_INFO: [
             (LUMI, "lumi.plug.maeu01"),