AudioService: fix deallock setBluetoothScoOn vs setMode

In AudioService:
setBluetoothScoOn()
  > setBluetoothScoOnInt()
     > synchronized(mSettingsLock)
     > muteRingerModeStreams()
	> synchronized (VolumeStreamState.class)
vs
setMode()
  > setModeInt()
     > synchronized (mSettingsLock)
        > synchronized (VolumeStreamState.class)

The issue comes from setBluetoothScoOnInt() releasing the lock
  on mSettingsLock before calling muteRingerModeStreams(). This
  breaks the expected lock ordering in AudioService, where
  mSettingsLock must be locked before VolumeStreamState.class.

Bug: 109746821
Test: see bug
Change-Id: I853ca60781efc506626b6345f27da701655ac359
(cherry picked from commit c106d9f9)