auto-t: remove device.wait_for_connected

I had added this without realizing wait_for_object_condition
can do this already using the device object.

autotests/testSAE/clogging_test.py

@@ -48,7 +48,8 @@ class Test(unittest.TestCase):
             wd.wait_for_object_condition(n.network_object, condition)
 
         for d in devices:
-            d.wait_for_connected()
+            condition = 'obj.state == DeviceState.connected'
+            wd.wait_for_object_condition(d, condition)
 
         for d in devices:
             d.disconnect()

autotests/util/iwd.py

@@ -564,31 +564,6 @@ class Device(IWDDBusAbstract):
             if self._adhoc_timed_out:
                 raise TimeoutError("Timed out waiting for peer %s" % addr)
 
-    def wait_for_connected(self):
-        if str(self.state) == "connected":
-            return
-
-        self._connected_success = False
-        self._connected_timed_out = False
-
-        def wait_timeout_cb():
-            self._connected_timed_out = True
-            return False
-
-        def connected_prop_changed(iface, changed, invalid):
-            if changed.get('State', None):
-                if changed['State'] == 'connected':
-                    self._connected_success = True
-
-        self._prop_proxy.connect_to_signal('PropertiesChanged',
-                                            connected_prop_changed)
-        GLib.timeout_add(int(15 * 1000), wait_timeout_cb)
-        context = mainloop.get_context()
-        while not self._connected_success:
-            context.iteration(may_block=True)
-            if self._connected_timed_out:
-                raise TimeoutError("Timed out waiting for connected")
-
     def __str__(self, prefix = ''):
         return prefix + 'Device: ' + self.device_path + '\n'\
                + prefix + '\tName:\t\t' + self.name + '\n'\