L2CAP: Reverse order in disconnection response

The DCID and the SCID (which are relative to the sender of the request),
and the Identifier fields shall match those of the corresponding
disconnection request command. If the CIDs do not match, the response
should be silently discarded at the receiver.

Test: cert/run_cert.sh L2CAP/COS/CED/BV-07-C
Bug: 141557006
Change-Id: I884007af3f2c032729f93319d3d5de43c3384966