managers: use async_method_call() set PID properties

In sdbusplus::asio::setProperty(), the property value will be wrapped
by std:variant automaticly, it will fail and show `Invalid argument
[generic:22]` error if we pass the property value that has been wrapped
by std::variant into sdbusplus::asio::setProperty().

Because the type of property.second is DbusVariantType, we cannot use
sdbusplus::asio::setProperty() for property setting, so change it back
to use async_method_call().

Tested on Bletchley:
Success PATCH the properties of StepwiseControllers.
```
{
    "Oem": {
        "OpenBmc": {
            "Fan": {
                "StepwiseControllers": {
                    "Test1": {
                        "NegativeHysteresis": 7.0,
                        "PositiveHysteresis": 8.0
                    }
                }
            }
        }
    }
}
```

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: I92d9e0d6ffe97fa6ce2905e17497d4d0fffa1d58

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