Bluetooth: Convert disconn_cfm to be triggered through hci_cb

This patch moves all the disconn_cfm callbacks to be based on the hci_cb
list. This means making l2cap_disconn_cfm private to l2cap_core.c and
sco_conn_cb private to sco.c respectively. Since the hci_conn type
filtering isn't done any more on the wrapper level the callbacks
themselves need to check that they were passed a relevant type of
connection.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --cc include/net/bluetooth/hci_core.h
Simple merge

diff --cc net/bluetooth/hci_conn.c
Simple merge

diff --cc net/bluetooth/hci_event.c
Simple merge

diff --cc net/bluetooth/l2cap_core.c
Simple merge

diff --cc net/bluetooth/sco.c
Simple merge