ARM: 6308/1: mmci: support card detection interrupts

If an IRQ can be requested on the card detected GPIO, use it instead of
polling.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 4e18f54..c7d373c7 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -147,6 +147,7 @@
 	struct clk		*clk;
 	int			gpio_cd;
 	int			gpio_wp;
+	int			gpio_cd_irq;
 
 	unsigned int		data_xfered;