Floss: Add LinkKeyMismatchRule to hcidoc

This rule detects auth failures that's caused by link key mismatch,
including when the peer device forgets the connection.

Additionally this CL changes the outputted addresses into
xx:xx:xx:xx:xx:xx format.

Bug: 285256429
Tag: #floss
Test: Run hcidoc with the feedbacks in b/284802375

Change-Id: I43035751fb01a3b1b9cbab74ae6694b139c6f9b4