Bluetooth: Check advertising cache in hci_connect()

When connecting to a LE device, we need to check the advertising
cache in order to know the address type of that device.

If its advertising entry is not found, the connection is not
established and hci_connect() returns error.

Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Acked-by: Ville Tervo <ville.tervo@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>