Bluetooth: Create debugfs directory for each connection handle

For every internal representation of a Bluetooth connection which is
identified by hci_conn, create a debugfs directory with the handle
number as directory name.

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

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

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

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

diff --cc net/bluetooth/hci_debugfs.h
Simple merge

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