Add the connection state change handle for the volume control profile

Volume control profile broadcast the connection state change only for the connected when the bluetooth service get connected with connected VCP device. The other connection state didn't be handled. In some case, it would causes the system ui or setting got the vcp profile connected and then no further update for the real connection state. The patch add the VCP profile connection state handle that is the same as the other profile.

Bug: 278982782
Bug: 279126500
Test: connect/disconnect and check the connection state change would
update

Change-Id: Ia94151456611a4bbe7d7291bb9c4931764b62b9b