Ensure global effects are on the correct output

Global effects such as the visualizer would sometimes not be on the
right output, for example when switching from a2dp to wired headset
or back, when there are both regular and deep buffer outputs available.
We now check which of the available outputs the global effect should
be on when more than one is available.
b/6528772

Change-Id: Ie268e32ef41e7888da67c24730dc93750a2cf579
1 file changed