audio: stop call before changing playback path route

When an output stream receives a routing command after the
audio mode was changed back to normal, we must first stop the call
and then apply the new routing to playback path. If the playback
path is applied while still in call, the logic will not change
current call use case routing.

Bug: 17016230.
Change-Id: Icea84c017e492e6524dbd4431f8c2a4ef8828c72