AudioService: Music resumed to speaker after call

Observed disconnect of A2DP is coming in and
scheduled with delay of 500msecs as non supress intent
and around same time connect is coming where it founds
device is already connected and triggers device config
change intent. And after timeout,scheduled disconnect
event gets triggered and removes A2DP device causing
music to route to speaker

Fix is to remove scheduled events when recent event
comes

CRs-Fixed: 2974286
Change-Id: I625226269474a4f4b122275bcaa5dddc19cfeaad