Bluetooth: Fix missing command complete event for mgmt_confirm_name

All management commands are expected to indicate successful completion
through a command complete event however the confirm name command was
missing it. This patch add the sending of the missing event.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>