policy-hal: Fix for alarm tone heard even after dismissing.

-For stopping the alarm tone played during in call,
handleIncallSonification must be called with second
parameter i.e. starting as false from setPhoneState
when the call is disconnected

-isInCall method retuns false,hence handleIncallSonification
is not getting called on disconnecting the call

Change-Id: Ia6398eb1b0a3cb117a16f9fd4cb3637f5ce17be8