stream-manager: Consider virtual streams when a device connection is changed

stream-manager: Consider virtual streams when a device connection is changed

Null device of a virtual stream is taken into account in case of the device
connection changes.

The device of the virtual stream should always be a null device. In addition,
the available device defined in stream-map.json for virtual stream type is
used to set the audio routing path of internal codec, so these information
must propagate to the audio HAL properly.

[Version] 11.1.35
[Issue type] Bug fix

Change-Id: Idb18334db04ed7d28ca657b1e58a4bb263e6af73
Signed-off-by: Sangchul Lee <sc11.lee@samsung.com>