pcmcia: autoload module pcmcia

Attempt to load the "pcmcia" module for 16-bit PCMCIA cards, so that
PCMCIA support becomes available without pcmciautils/udev userspace
interaction. Based on a suggestion and a patch
Signed-off-by: Komuro <komurojun-mbn@nifty.com>
but converted it to request_module_nowait() and move it to a later
stage.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>