Revert "libaudiohal: Make closing of HAL stream an explicit call for AudioFlinger"

This reverts commit e5a38eb5.

Reason for revert: DroidMonitor: Potential culprit for http://b/433541259 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Fix: 433541259
Bug: 425272644
Change-Id: Ifabacb208402ec073753b2f32bb7371288d8f50a