Fix audio switch of speaker -> BT LE or speaker -> HA issue.

Currently in U, only speaker, BT LE and hearing aid device use
set/clear communication device of AudioManager to enter/exit its
audio routes. When we try to switch to BT LE devices or HA
devices, in order to do it succesfully, try to clear any already
set speaker communicatio ndevice.

Bug: b/283198536
Test: atest BluetoothDeviceManagerTest
      Manually test speaker -> BT LE/HA devices to make sure it
      worked as expected.

Change-Id: I9ad4b830a1347bb8a258ed8af24c54ea1afb155d