floss: add identity address to accept list if ll privacy is enabled

When ll privacy is enabled, the identity address should be added to the
accept list. Use the helper function to get the proper address.

Bug: 235218533
Bug: 307218612
Test: manual test reconnect/wakeup with a mouse using RPA
Test: mma -j32
Flag: EXEMPT Floss only changes. The code is tested in autotests.
Change-Id: Ic46efc221f72a27f2563bd9f1dc0c54f33daf887