Handle AVRCP volume control issue

For the AVRCP volume control command(PDU ID: Set Absolute Volume and Event ID: EVENT VOLUME CHANGED), which needs to use the same transaction label from the CT command.
Now Statemachine wants to use this label, but the service did not send it to the state machine.
So add the label when sending a message to the state machine.

Bug: 311772251
Test: atest AvrcpControllerServiceTest
Change-Id: I3aa87f2a5bbca598d5cb45d109228c13e6dffab5