audio: remove handset pop-noise

When receiver opens immediately after it is  closed, the pop-noise
occurs.

Change-Id: I8e5374edea9f8710963b7669e64b109db2354650

Signed-off-by: poondog <markj338@gmail.com>

idea is taken here -
https://github.com/poondog/joey-m7-GPE/commit/3fa785300043ddb42ddf59a08f90d70080135196