Internally link stack/acl/btm_acl::btm_ble_get_acl_remote_addr

Towards readable code

Bug: 163134718
Tag: #refactor
Test: act.py -tc BleCocTest
Test: ble paired 2 phones
Test: classic paired Bose SoundLink

Change-Id: Id440b966613aaeb4b39ece7d4517a5158e823456