Adding hci_dev_lock since hci_conn_params_(lookup|add) require this
lock.
Suggested-by: NMiao-chen Chou <mcchou@chromium.org>
Signed-off-by: NAbhishek Pandit-Subedi <abhishekpandit@chromium.org>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>