AudioService: fix cross deadlock

Commit 5bbcd44c introduced a cross deadlock between
AudioDeviceBrocker.mDeviceStateLock and VolumeStreamState.class
by locking VolumeStreamState.class before calling
mDeviceBroker.isAvrcpAbsoluteVolumeSupported().

Bug: 132098030
Test: make
Change-Id: Ia6e6e1e407a2ddcff7931d508fc142ee8ee652b9