jf mute call audio workaround

This allows audio mode IN_CALL -> NORMAL to complete voice
deroute before we try playing any tones.  Without this,
a race can occur where alsa_sound gets confused and does not
clear voice acdb state.  If this happens, the next call does
not reset acdb state and results in mute audio.

Change-Id: Ie91fa5d2e7d9f03cde0cbeee06fe61fc731122b9