Made IAudioService.setBluetoothA2dpOn() not oneway

IAudioService.setBluetoothA2dpOn() should not be one way as
IAudioService.isBluetoothA2dpOn() will return inconsistent results
if called just after.

Bug 6572651.

Change-Id: Ib03ae49e6c0041b1b37dcac9e198cd93a4794030
1 file changed