audioflinger: fix duplicating track start with a2dp output suspended

When the output stream is suspended, we must not wait for the HAL
to exist standby or the kernel position to start moving as this never
happens.

Bug: 281952473
Bug: 218803475
Test: repro steps in bug
Change-Id: I6c4f5d6b4c6a598d21f49e43468dc174571b960a