Audio continue to played even if paused manually

We need to define a special state indicator for lossing
audio focus transitorily to distinguish between pausing
by user and the new focus owner

Now audio will continue to be played after user got a
notification or a phone call even if it was paused
manually before

Change-Id: I9e8beaedb0fcc5afe920068297ed9c387eab2ac8
Signed-off-by: Roger Chen <cxr514033970@gmail.com>