AudioFlinger.cpp - audioConfigChanged_l set for srs Tunnel Device Switch

 - During device switch we were only setting the route
   but was not calling audioConfigChanged_l
 - Hence the effects for the new device would apply only
   when there is a config change.
 - Now we call audioConfigChanged_l during device switch
   setPrameter so that the new effects will be apply as
   soon as device is switched.

Change-Id: I641cd8a7d6ffb7423ccfaa45e4c29b1b5352e61e
CRs-Fixed: 548021