Make auto play disablable

Enable/disable auto play for BT handover by config.
Although the config is disabled, it should care the case
which handover from the connected BT speaker to another one.
In that case, music should be resumed when handover completed
if any music was active.

Test: BT handover during playing and not playing music
Bug: 112245865
Change-Id: I71709ea987853767dbebb6d3f9fb55fcdb2bfa13