audio policy: clean up initial spatializer audio patch

During audio policy initialization, a spatializer stream is opened and
then closed but the audio patch cleanup normally done in closeOutput()
was omitted causing a stale audio patch to remain in audio flinger and
audio HAL.

Bug: 333829626
Test: repro steps in bug
Change-Id: I525c1c2fc91d6fc70bfd602c699562658e9bb7a1