Revert^2 "Use aconfig flag for flaggedApi"

This reverts commit 9a4b6b9c.

Reason for revert: Re-landing the fix and check the test is passing

Bug: 318901016
Bug: 321154514
Change-Id: If7985865d390258fee976833b8e29aad307e0fa2
Fix: 318901016
Test: atest StrictJavaPackagesTest
Test: m framework-bluetooth | no-op change from logical point of view
Flag: Exempt, build change.. or said otherwise: This CL is the flag :)