Reset output device when a bit-perfect client becomes active.

When a bit-perfect becomes active, there must only be one mix port
connected to the selected device port. In that case, reset output device
for all outputs that are currently connected to the selected device
port.

Bug: 357786293
Test: switch playback between YTM and DSD file player
Flag: EXEMPT bugfix
Change-Id: I4c59ea1771fb6c1f130d8dce9076b324b1acea5b