Bluetooth: Make Bonded device list operations are synchronous

Change the bonded device list to CopyOnWriteArrayList,to take
care of concurrent add/delete operations to the bonded device
list.

Change-Id: Ia4de2d35f2e30d6407716d0e60dc3bf4d05a2ac5
Merge "Bluetooth: Make Bonded device list operations are synchronous" into du44