[PATCH] pcmcia: add bus_type pcmcia_bus_type

[PATCH] pcmcia: add bus_type pcmcia_bus_type

Register a bus_type pcmcia_bus_type. This means the initialization of
the ds module needs to be done in two levels: one quite early
(subsys_initcall) so that drivers may use the bus_type; the other one
must stay that late (late_initcall). As only one initcall can be
specified within one module, some tweaking is needed.