policy_hal: Revert sound trigger changes related to device switch

Revert the synchronization fix handled in
Changed-Id: I9f1c4f82b84805b5f7a0aa770b333e7f2aeee21c
as it's already handled as part of upstream soundtrigger
AOSP refresh

CRs-Fixed: 1108103
Change-Id: I796230b2e1f5e02ed84e29eebc0e7d7be54c1842