pcmcia: setup IRQ to be used by PCMCIA drivers at card insert

Setup the IRQ to be used by PCMCIA drivers already during the device
registration stage, making use of a new function pcmcia_setup_irq().
This will allow us to get rid of quite a lot of indirection in the
future.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
diff --git a/include/pcmcia/ds.h b/include/pcmcia/ds.h
index aab3c13..52ebe75 100644
--- a/include/pcmcia/ds.h
+++ b/include/pcmcia/ds.h
@@ -95,6 +95,9 @@
 	config_req_t		conf;
 	window_handle_t		win;
 
+	/* device setup */
+	unsigned int		irq_v; /* do not use directly yet */
+
 	/* Is the device suspended? */
 	u16			suspended:1;