audio: Fix for Sound from handset leaks to speaker

Greeting message leaks to speaker since touch sound
(for stopping greeting message playback) is routed
from handset to speaker. Fix by also checking
againt primary output for new output device for
inCall usecase

Change-Id: Id2fd20de7a279f74e38a9aefe91e17b36cc9da6f
CRs-Fixed:812723