bluetooth: Delay A2DP Absolute Volume setup until property is available
The Volume property on org.bluez.MediaTransport1 is required to utilize Absolute Volume, but it will only become availabe if the peer device supports the feature. This happens asynchronously somewhere after the transport itself has been acquired, after which the callbacks and passthrough mode (in case of a2dp_sink) will be enabled. For safety the setup is also performed if the property is already available initially.
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