PCMCIA: soc_common: remove soc_pcmcia_*_irqs functions

Now that we use gpios and gpio_to_irq() etc to manage the various card
status signals within soc_common, and all socket drivers are converted,
these functions are no longer used.  We can now get rid of these helper
functions.

Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>