Revert "AudioService: protect volume APIs for AAOS"

This reverts commit 68390dc2.

Conflicted revert -- Left imports in to resolve.

Reason for revert: b/310673477 - Flag was never turned on in staging,
    turning on the flag on fails platinum SysUI volume tests.

Change-Id: Iba89968d45f5c978456a6617e83fb0973ef9b624