Floss: Hcidoc: Take LE connection via accept list into account

Previously we assume LE (extended) connection packets should contain
the peer's address. However floss is connecting LE devices via
accept list intead. This causes false messages to pop up, e.g.
"unknown address", "dangling LE connection", etc.

This CL adds a simple accept list management to support floss's LE
connection flow.

Bug: 293397988
Tag: #floss
Test: analyze feedback 91179429567, verify no above false message.
Change-Id: I7ae50b19399568c5723b4e1db7905ce7628487df