BTM: Always encrypt ACL after auth complete

Setting encryption aggressively can improve the success rate of CTKD and
protect privacy. The availability of CTKD should not be the requirement
of encryption after auth.

Tag: #stability
Bug: 198755234
Test: gd/cert/run
Change-Id: I6ea10cfd4331cb31bad74230a04e3e614c1b7fe1