[BUG 0 / 6] L2cap: Spec violations

[Sungwoo Kim]

Hello,
Our fuzzer found six spec violations, illegal state transition.

1. BT_CONNECT2 -> BT_CONFIG by L2CAP_CONN_RSP
2. BT_CONNECT2 -> BT_CONNECTED by L2CAP_CONF_RSP
3. BT_CONNECT2 -> BT_DISCONN by L2CAP_CONF_RSP
4. BT_CONNECTED -> BT_CONFIG by L2CAP_CONN_RSP
5. BT_DISCONN -> BT_CONFIG by L2CAP_CONN_RSP
6. BT_DISCONN -> BT_CONNECTED by L2CAP_CONN_RSP

All expected behaviors are ignoring incoming packets as described in
the spec v5.3 | Vol 3, Part A 6. STATE MACHINE.
Also, I assumed BT_CONNECT2 is corresponding to WAIT_CONNECT in the spec.