audiopolicy: Fix to close all opened inputs in closeAllInputs

 Sound recorder app freezes if device switch happens from usb-mic to
 handset-mic during recording
 During device switch, closeAllInputs is called and all opened inputs
 are closed. But loop is not executed to close all the opened inputs.
 Fix the issue by closing the opened inputs in decrement order.

 CRs-Fixed: 920308

Change-Id: Ib3ac78fb3d9d20aa42948d25d32d69a897ab5c5b