[PATCH] fix s3c24xx gpio driver (include linux/workqueue.h)

The general gpio driver includes seem to now depend on having
<linux/workqueue.h> included before they are.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/spi/spi_s3c24xx_gpio.c

@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/spinlock.h>
+#include <linux/workqueue.h>
 #include <linux/platform_device.h>
 
 #include <linux/spi/spi.h>