L2CAP: Fix configuration_request timeout

On configuration_request timeout, we need to send a disconnect request
with correct scid and dcid. Also fixed the cert test for this

Bug: 145720848
Test: run_cert.sh test_disconnect_on_timeout [L2CAP/COS/CED/BV-08-C]
Change-Id: I408eb14914b14ca2b7d6de68ff0480daf2dcb3c8