hal: fix routing issue for voip use case

During device switch, all the use cases on a shared backend will
be derouted before disabling the current device and rerouted after
enabling the new sound device. Rerouting of voip use cases
was not taken care properly which is fixed now.

Change-Id: I394c0d34fe36d42ce615414ea0524a58c10a5f79
1 file changed