hal: fix no audio when switching devices in voice concurrency

When voip usecase is active and voice call is recieved, voip
usecase will go to standby causing devices to be disabled
resulting no audio in voice call.

CRs-fixed: 589353, 592531
Change-Id: I6d5e2f9c5dd72438affd82799333d7227c72533f

Conflicts:

	hal/audio_hw.c