atm: simplify lanai.c by using module_pci_driver

This simplifies the lanai.c driver by using
the module_pci_driver() macro, at the expense
of losing only debugging messages.

Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>