Populate microphone characteristics for supported microphones on
platform. Map input sound devices to specific microphone ids.
Change-Id: I9aab6ef04bb941533261740723ffcf78645d3e1e
Keep_alive can now handle silence playback on multiple concurrent
devices such as primary output devices as well as HDMI
Change-Id: Icdf22c9d8d1264d463b23c8f54020e792840b73c
Signed-off-by: Md Mansoor Ahmed <mansoor@codeaurora.org>