Bluetooth: Improve error handling in connect acl

With this patch -EOPNOTSUPP will be returned by hci_connect_acl for LE
only controllers. If it is dual device with disabled BREDR -ECONNREFUSED
will be returned

Signed-off-by: Lukasz Rymanowski <lukasz.rymanowski@tieto.com>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>