hostap_cs: Remove irq_list, irq_mask and pcmcia/version.h

Remove irq_list, irq_mask and pcmcia/version.h as suggested in
http://kernel.org/pub/linux/utils/kernel/pcmcia/pcmcia.htmlSigned-off-by: NJouni Malinen <jkmaline@cc.hut.fi>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Update hostap_cs to use new PCMCIA event callback registration.
Signed-off-by: NJouni Malinen <jkmaline@cc.hut.fi>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Includes minor cleanups from Adrian Bunk <bunk@stusta.de>.